The review mentions that the screen is a bit small for all of Krita and suggests that using something like a big iPad probably provides a better experience.

As this is only about Android I thought of promoting my take on this problem. In fact I released a small program I use to take handwritten notes via iPad on my Linux system just a few weeks ago. It works on both Android and iOS and basically turns these devices into graphic tablets. You can take a look at: https://github.com/H-M-H/Weylus