GB WhatsApp do give many features but i am not confident if it will be safe. Like WhatsApp can disable/delete your account or your end-to-end encryption thing is safe or not and there may be privacy issues...
Afaik, Knox is not involved between GB WhatsApp and you ... It only detects security breaches on hardware level... Like rooting or forcefully digging into Secure folder or locked area... Using app and data in that app is not what Knox protect ig
