I just put 'Brisbane lions 2020 choked' into google. The seventh result was this thread - your post specifically - and nothing before then substantiated this. Weird if everyone was saying it!
Well people weren't necessarily using the exact phrasing I used.
Look, it was a common talking point across most of the footy shows after prelim week that year, but sure, if you want to pretend criticism of Brisbane for failing to take advantage of their home advantage during that Covid year never happened, then you do you. Rewrite history if you want.