You can delete all data the Service holds about you in either of these ways:
Removing the app in Threads settings (Account → Website permissions) stops all processing and deletes your access token right away; use one of the options above to delete the rest.
Deleted: your account, Threads access token, promotion profile, keywords, stored posts, drafts, published-reply records and metrics, device push tokens, and usage records.
Questions: support@trysquizzy.com