It is possible that the same temporary (read-only?) access that would allow you to delete the tweet would also allow you to capture much of the relevant evidenc

It is possible that the same temporary (read-only?) access that would allow you to delete the tweet would also allow you to capture much of the relevant evidence: • fetching the offending tweet via a raw/API method could, in the JSON, reveal more metadata – such as involvement of some compromised 3rd-party app with posting rights to your account • requesting your entire Twitter archive might similarly still be available (as they offer it largely due to the EU's legal requirement), and include the offending tweet with full metadata Requesting the latter – your full archive – without supplying any more new info (your phone number) might be a tactic with leverage given the EU-compliance dimension. (Though, it's also possible the regulators have already approved phone-number-verification as a reasonable prerequisite for such a giant personal data dump.)