It's weird how rarely I see people point this, but in theory this kind of boilerplate should be technically meaningless. If copyright protections include the privilege to use the work for training a machine learning algorithm, you need explicit permission anyway. OTOH if it's fair use or otherwise not something copyright law is concerned with, the copyright holder's objection doesn't matter.
For the record, I think AI models are derivative works and thus they're not only infringing on typical "all rights reserved" works, but also things such as Free software whose license terms require attribution if used in derivative work, and especially share-alike copyleft licensed work.
The whole Cloudflare bot detection is so weird and eerie. I've had issues where I can't get past it presumably just because I'm using some in-application browser just to get a login cookie, but other times it just lets fucking curl through no questions asked.