I mean it’s probably fine for old viruses, but no new virus will ever be made without being able to fool windows defender, that’s like the bare minimum for any hacker crafting a virus today.
If you want a good free antivirus i suggest Avira.
It’s all kinda moot though, windows 11 is spyware at it’s core, when your OS is a virus, it’s clear that you don’t really mind being infected by one, so why bother defending yourself at all?