Each AI assistant connected to your wp2ai account (ChatGPT, Claude, etc.) has its own access, independent of your sites: an assistant connects to your account, not to a specific site.
From Settings > AI Assistants, the "Connected assistants" list shows each assistant with a "Revoke" button.
Revoking an assistant immediately cuts off its access to your entire wp2ai account: it can no longer propose any action on any of your sites. Your other assistants and your site connections aren't affected.