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Meta Will Nuke Your Instagram Account If You Delete Threads Profile
(tech.slashdot.org)
This is a most excellent place for technology news and articles.
If have undestood correctly this is only when you've logged into Thread using your instagram account and even then you can delete your Threads account but if you want to delete the profile they have created of you then you need to delete instagram aswell.
I don't think this applies if you made a new account for Threads that isn't linked to your IG.
Correct