I know you're paraphrasing, but I'm not sure she accused everyone of lying? And surely much of Depp's case is arguing the same thing, that her witnesses are lying?
A lot of what was said was perception-based rather than 100% black and white, true or false. For instance people claiming they didn't see something - could be true, could be they turned a blind eye.
In terms of specifics, there was the island manager (I don't remember her name) who claimed she'd never seen Depp passed out but was impeached on that because she admitted to the incident where Jack found his dad passed out on the beach, and she was present.
With Kate Moss, she mentioned a well known rumour and her fear at the time based on that rumour.
The police who were called to the penthouse did lie in one respect because CCTV shows they were in and out in 15 minutes. I believe they said they were there for longer. Also tbf LA police have a bad reputation for corruption. At one time I would have thought that was a bit of a reach but there are now so many examples of police lies, arse covering and mendaciousness, here and in the US, I take them with a big pinch of salt these days.
The trailer park manager - she said he wasn't there and couldn't really have known how that situation went down, and disagreed on the extent of the damage. He follows at least one Depp 'superfan' twitter account and there are some... interesting reviews online about him going back several years. He came across as a bit of a creepy 'dudebro' type who wanted to ingratiate himself with Depp, to me.
So overall I don't find it the incredible that some of those witnesses saw whatever was most expedient. I actually think it's scary how much influence someone as rich and famous as Depp can have. All those paid bot accounts, a lawyer with links to Putin. Texts from him berating the medical team for not getting Amber under control, excoriating Stephen Deuters for his disloyalty over the texts he sent (he seems to be back in the fold now with a very cushy job working for Depp), texts to Kate James about 'fixing Amber's flabby ass'. I'm not a conspiracy theorist by nature at all, but he seems dodgy as fuck to me.