Because of how Thunkable X apps are built, they will ask for all of the permissions that any Thunkable app could possibly use. Long term this won’t be the case, but that’s how it’s setup right now.
I think we’ve removed the SMS permission from Thunkable X apps in a recent release, so if you download your apk again, then the SMS permission won’t be there, and this e-mail from Google Play will not affect you.