I think OP is an instance that proves the point this is a lazy, clumsy editing attempt, done through a document registration service which exists to prevent ex

I think OP is an instance that proves the point this is a lazy, clumsy editing attempt, done through a document registration service which exists to prevent exactly this and yet, you have to be an experienced nerd (eg https://en.wikipedia.org/wiki/Matthew_Garrett https://en.wikipedia.org/wiki/Matthew_Garrett has a doctorate and decades of software development experience) who will jump through a bunch of hoops to even begin to build a case beyond he-said-she-said. And he still doesn't have a settlement or criminal conviction in hand, so he's not even half done... Or look at the extensive forensics in the Craig Wright case just to establish simple things like that they were edited or backdated to a legally acceptable level. Meanwhile, the original PDF edit in question took maybe 5 minutes with entry-level PDF tools.