Meanwhile I haven't personally heard about Denuvo being used as a front for CCP data theft but since Denuvo is based in Austria and their owners Irdeto are based in the Netherlands (both subject to EU's heavy data protection laws) it's difficult to imagine. I'm guessing the idea came from Irdeto's South African owners also having a sizeable stake in Tencent? But that's pretty tenuous.
Honestly, the only reason people were screeching that Denuvo was some kind of CCP datamining rootkit was, and it really irks me to say this, because Genshin Impact was a Chinese made game, and thus racist asshats automatically assumed that because Denuvo installs it's self inside your PC's kernal, it therefore must be some kind of absolutely insane conspiracy that the game was some how designed specifically to steal your information.
The whole thing was beyond being tenuous, it was literally just racist redscare tactics because Genshin was a chinese-made game. That's it, that's the entire reason. Denuvo isn't great, and my biggest gripe with it comes from it causing games to chug because of how invasive it is. As far as it being some kind of malicious piece of software, though? No, it's no more malicious than Gameguard or, on topic, the Tweaker or FFXI's Windower.
But racists gonna racist, sadly. It's really like you posted - people are completely misunderstanding what certain software does, and use popular buzzwords like rootkits, bloatware, and data-mining to somehow try to push their own personal agendas towards whatever software they don't like. But when there's actual need for evidence to be presented - be it Denuvo, the Tweaker, or anything of the like, it always comes up completely flat.
Even trying to argue that the Tweaker is somehow bloatware is laughably flimsy, since one need only look at their CPU processing and usage through the task manager to quickly understand why, and how, that term doesn't apply to the software.