Checked the authors website; watermark made searching for it easy. They have been using this consistent art style since 2021. They have been posting art to Twitter since 2011.

Don’t know what in this comic you could possibly see as a give away for AI use.

I don’t know why you are so insistent that everyone who mentions Windows is using a online account, but you actually do not need a google account to use an android device in most cases. I have been using android phones with no logged in account, with side loaded app stores and independent apps for years. Maybe the mainline flagship devices enforce it; I haven’t had that problem personally.

Google would really like to crack down on installing software without their permission, and they still track every bit of information they can with the Google Play API even without an account, but I digress. I haven’t had a google account in several years. Or a Microsoft account either, for that matter.