well 20 minutes of rewatching is tiring 
so ok, first some introduction:
- it is good manners to report the time in which you say there was cheating. it is a match of 20 long minutes, you must specify where you think it should be looked.
- say the type of cheating you suspect there was.
- as Roku said, the game does not allow full stacks against people who do not have the same number of players in the party on the other team.
so, personal response: I didnāt see any suspicious cheats 
. definitely NOT aimbotting. their dps were damn poor in aiming, especially their genji who was almost always on secondary fire all the time 
. their ashe had a minimum of aim, even if she was better at managing ammo rather than secondary fire (she almost got more kills with primary fire spam at medium range). but definitely no weird moves. itās pretty legit that they get kills for a match that went on for 20 minutes.
I didnāt see any suspicious wallhacks either, i just saw too many bad positionings in your team. frankly you were too isolated from your team when you started with moira. you made a better choice with mercy to reach them better in the various heights of the map (before being tailed by their Sombra.)
I saw terrible resource management, butā¦ from both teams, not yours specifically. However, I couldnāt help but notice how many times you stopped, probably to chat with your team. Not that I care what you said to each other butā¦ I saw you do it a little too often, and it only makes the teamās morale worse in the case of gameplay notes. and if you were too busy saying ācheater here, cheater thereāā¦ bad approach.
from personal experience, some advice without presumption:
- if there really is a cheater, just say āsuspected cheater, be careful, review replayā. and thatās it, nothing else: play the match until the end and then review everything afterwards. no one is interested in speeches about the cheating police, especially with the game having really short chat times (unless they are your friends or you are there with the microphone discussing among yourselves). we know that if the game detects cheating it refunds the losing players hence denied competitive points. so finish the match to the best of your ability and your duty to say that you suspect there is a cheater, especially if none of those players are your battlenet friends.
- you look at the replay code again calmly (no, āI know, I remember it, I donāt need to review itā does not apply, you really need to identify your suspicious points)ā¦ and report it after having REVIEWED the replay code. if only to have a certainty of your impressions;
- you talk about it here with the conditions I mentioned before, if only to help us understand your impressions. it is always better to have targeted feedback rather than one that simply says ācheatā without indicating who or what. those times that people have kindly left me their replay code very often it has been more useful in identifying bugs in the behavior of the abilities. bugs that often end up going viral on reddit / twitter and that developers fix in the next patch note.
- letās be clear: Iām not interested in correcting you on how you play
. and if your judgment is adamant that you only have cheaters in your matchesā¦ well, Concord (that playstation game) has taught us that there is nothing more harmful than a game that is ignored, which is perhaps worse than a game that is spoken badly of. You uninstall it, for the correctness of your perception of time in the game. but if you then come back here to āproselytizeā about making others uninstallā¦ is wrong, because in that case you are talking about a game that in the meantime updates while you are not there. for simple respect of the facts, we only talk about what is used, but then everyone must be autonomous in saying if or what they want to play. for you cheaterwatch is unrecoverable? dont come back, itās your right . but if you come back, follow the advice mentioned above about being very clear on your desire to improve the situation (if you have that intent, of course.)