1. not a vac ban, that's a game ban.
2. remove that avatar, don't advertise for scam sites.
I don't know what caused your game bans, game bans are given for many many reasons not just cheating.
but know that you deserve it for advertising for scam sites.

Nvidia Geforce doesn't cause bans, promoting third party scam websites however does.

Read this: https://psteamhelp.yuanyoumao.com/en/faqs/view/4E54-0B96-D0A4-1557

Game bans are given for multiple reasons, not only cheating.

You don't need to cheat in order to misbehave in the game.

引用自 Dukaaaaa07SKINS：

I should also mention that I use Nvidia GeForce Now to play CS2, which would also make it impossible for me to use any sort of third party assistance.

1 game ban on record | Info
9 day(s) since last ban

you got a gameban and there are a few reasons for it, also its permanent. Also geforce now doesn't cause a ban

引用自 JacquesPatat：

Also geforce now doesn't cause a ban

That is exactly what OP knows and posted about, OP probably wants to know the reason then, besides cheating. But for that OP only needs to read the linked article.