Android is running a Linux kernel, yes. But, as an enthusiast GNU+Linux desktop user you'll find that you can't do your linuxy stuff on Android - sure, termux does a lot, but it's just not the same.

The Surface Go 2 that the article is about, is an x86_64 device - I recently aquired one and it's really quite nice with Linux in my limited testing. The biggest difficulty with a standard desktop GNU+Linux on a tablet is that most distributions are not optimized for easy tablet use - KDE Neon User Edition e.g. does not come with a virtual keyboard preinstalled.

On Yoga style laptops: Well, they are easier to get started with, but they often are quite a big bigger and having those keys on the back all the time... It's doable, but if you want a "nice 10" tablet" experience these devices are just not what you will want: Too large, too thick, too heavy.