Yes, it's not fully true. Things survive in any preserved form only if they are regularly used. Then you have the Mandela effect which changes the actual record to something close but not accurate. And I read that our permanent memory may do the same to our oldest recollections, rewriting it each time you remember.

I wonder how many of the oldest memes or anecdotes of the old web those of us who were around remember aren't actually correct. Wait, this isn't showerthoughts...