Just depends on what kind of keyboard you're using and why. This is a very specialized keyboard for specialized tasks. I could see lots of different kinds of activities and roles it could be extremely useful for.
For programming, you probably wouldn't want it... though maybe some percentage of programmers who feel their brain moves a lot faster than their fingers might like it. Combined with stuff like Tabnine and Copilot, you hypothetically might eventually be able to "predictive-program" at an incredibly high speed. You'd inevitably have to spend some time revising bad predictions afterwards, but the total amount of time spent developing could decrease by a lot.
I don't even care if this is an ad. If it is, it worked and is the first and only ad I've appreciated. I've never impulse bought anything, but I'm buying this thing right now* after spending 10 seconds looking at it. (I used to spend a lot of time on online typing competition sites, so I'm closer to the target demographic.) My only concern is how much it might affect my normal typing muscle memory.
*As soon as it becomes available. Seems to be sold out, unsurprisingly.
Predictive tweaks aren't good in a keyboard, you want everything to be intentional, or you'll lose time and patience correcting things. Spellcheck should be post hoc imho.