No it’s not.
What is not allowed is bumping, or necrobumping, NOT necroposting on its own.
It would be cool if you actually read what you are using as your evidence 
Bumping is considerate spam because it’s an act of posting short message, usually deprived of any substance, and consisting of the single word “bump” (sometimes even single character) to bring back an inactive thread to the top of the forum to bring attention to it.
Necrobumping is the same, just after a long time, and it’s NOT inherently necroposting.
Necroposting on its own can be broken into two distinctive groups, where one is revolving around posting effectively trolling messages after a long time, and the second is revolving around people simply continuing conversation about given topic. While the first group can be considerate spam, the other can’t, and kwrqzz simply didn’t spam 
In fact, if we were so formal about it, your complaining about necroposting is so far the biggest spam in this thread.
If you really cared about rules so much, you would report the thread/post, and move on, but instead you are adding to the pile, and becoming the one who is actually spamming, lol
But I forgot, you always need the last word.