I still don't get how those 1000 posts tallied with previous UUID would get correlated with the new UUID. If it's only source IP address or similar finger prints, those are relatively easy to get rid off, hide, renew.
(At least, when your goal is to do as many fake attestations as possible rather than use your device for something more useful)
You buy a new phone, install the app, and get an uuid with 0 attestation count. Now what? If you try to use that uuid to farm attestations, it'll be easily linked to that uuid. If you try to uninstall/reinstall, the attestation count will count up, eventually making making the newly created uuids immediately suspicious. You might try to create one uuid per month and then try to farm those indefinitely, but they could require you to reattest every month, which should come back with 0-1 attestations, but if you were farming uuids that'll be immediately caught.
I guess I just misunderstand what is being attested. Is the attestation proving that your randomly assigned UUID belongs to a human, or conversely, does a proof of work simply prove that your device "owns" some UUID?
(At least, when your goal is to do as many fake attestations as possible rather than use your device for something more useful)