Chromium is controlled by Google.
Browsers down steam on Chromium will either pull from chromium or fork from it.
They hold >75% of global browser market share.
They make a change, like enforcing Web Environment Integrity API, you either comply or your competing chromium browser will.
There’s no way to say this one way or the other until it’s implemented.
However to “verify” a system from a hardware level to any decent level of accuracy would require kernel level access.
Technically you’re correct, until you’re not.