With it, you can use your Xbox controller to move around the screen and type.
Does that mean you couldn't before? Seriously people were playing around on a handheld that couldn't even type?
Button accelerators are also available; these include the X button for backspace and the Y button for the spacebar.
WTF!? Isn't that standard also?
For better movement patterns, the keyboard keys are aligned vertically."
Does this even make a difference?
In any case, the title is bullshit, it should be that will make windows handhelds close to typing on consoles which sucks. Typing on the Deck is a completely different experience, one that can't be replicated in any of these handhelds because they lack the hardware to do so.
There are probably some games that this would work well for, but I'm not sure that it'd be a great replacement the way a physical thumb keyboard is for texting or the like.
Most present-day games that I can think of that I play use the keyboard as a grid of buttons. They expect to have your hand over the thing -- often the left hand, with the right on the mouse -- to let you be able to push multiple buttons quickly.
I'm not usually doing much text entry, which is what I'd expect a thumb keyboard to work well with.