I saw a bike that recently had this kit installed on it, and was surprised at the radial spokes:
From having done rebuilds on 20" motor hub wheels, I can appreciate the temptation to look at going radial. Otherwise, even at 1x, correcting the spoke line at the nipple to avoid built-in stresses takes some careful work. The default angles are extreme, the space you have to work in is limited, and it has to be done at just the right point in tensioning to do it well. Getting it physically laced up is also somewhat challenging, which is probably enough in and of itself to make low-quality manufacturers look for alternatives.
I can also appreciate that with the spokes being so much shorter, forcing them to resist torsional loading in a radial pattern is less of an issue than it would be on a full size wheel. But this is a hub motor. Is there any possible way the math here to choose radial is sound? Or was this just a mistake, or a willfully cynical design?