Quote from Vanced Telegram moderator:

IMPORTANT NOTE:

Some people are spreading fake reports on some telegram channels that Google is banning Google accounts of users who are using Vanced apps without providing any proof as such. Moreover, speaking of proofs, when someone sends these messages to you, ask them for proof/context. If the proof doesn't say anything specifically to youtube Vanced or doesn't exists at all, just block and report those people spreading baseless claim and ignore.

TL;DR: This is for the information to all YouTube Vanced and YouTube Music Vanced users, if you come across any post which says anything related to the Google account ban being the result of using vanced, please ignore such messages.