Yes I admit, I am assuming that on evidence from a previous event that had fixes but not the fixes we expected. It has indeed been different for many expansions, that’s why I was so surprised to see what happened in Shadowlands with the Winter Veil event.
I did have a look again to the GM response and it doesn’t instil me with confidence that he basically said: here’s a wowhead link, the GM team doesn’t answer these things for you.
Now, I absolutely want to be wrong (I levelled 50 characters to 50 for this event in BFA). As to my motivation: I’m taking the worst possible outcome in mind (and preach it) so people still have some time left to level characters if they want/care to (I myself am not, since I don’t want to burn out on SL. Probably will end up with 5 level 60’s at the start of the event).
Edit:
Added Ret’s comment.
I’d want to make it clear: only the first and last sentence in that grey block is from the GM. The middle bit is just the quote from WoWhead article.
So, yeah. We could really use a proper answer from a Blizzard Employee here.
The right thing would be to have the mount drop at level 48. Like previous expansions.