The placement and form factor of these keyboards is not suitable for applying a classic touch-typing technique.
To touch type as professionally trained, a keyboard must be in front of the typist, equally accessible with both hands, with limited number of rows (palms must stay close to the "standard position"). The keys should not make vertical rows, keys in adjacent horizontal rows must be slightly shifted, the key size is dictated by finger size and cannot be too small. The standard key placement is helpful, but also other can be learned as long other requirements are met (which, for these keyboards, are not).
Just putting letters in QWERTY order is not helpful. Probably nobody writes novels, computer software or E-mails to multiple customers on this keyboard, so limited typing speed is not much a problem.