No, it’s a mostly full keyboard. There are single keys (each finger has 5 directions) for whole alphabet, alt, control, arrows, everything. There are a few that require multiple keys at once, but you can sequential type like a funky mapped keyboard. But, you don’t have to sequential type, which is the whole point and where the speed comes in. For example, to type “the” you just press t+e simultaneously, then release. None of it is predictive, it’s all deterministic, with some pre-defined, but customizable, “chord” lists (the keys you mash to make the word). You do have to memorize these, but most are pretty natural, and since you always type sequentially, you can work them at whatever pace.
I just received mine, and it’s pretty neat. My day job is coding, and I don’t see why it would be a problem, so far.