Is there a public page/link which mentions that they're not removing V2 support? Please share. Thanks.

All I can find is:

We have not yet set a deprecation date for Manifest v2 but expect it to be supported for at least one year after Manifest v3 becomes stable in the release channel.

https://blog.mozilla.org/addons/2021/05/27/manifest-v3-updat...

So they will eventually remove it sooner than later.