If it were up to me then I would, yes. On the other hand I could buy the argument that the 2020 playoffs should be discarded by the pedantic argument that the 2019-20 season (the whole COVID thing with the premature end to the regular season and special playoff aside) counts as part of the 2010s, because as I pointed out earlier, for the same reason that the 21st century didn’t technically begin until 2001 because the was no “0 AD” year. I do love pedantry, after all.
But it is ultimately up to you since it’s your thread. However, if you want to keep it to 2021-2025 playoff years only, I would personally recommend changing the thread title to reflect that more accurately.