It looks like they are built around Epson printheads. So they are at least partially leveraging known-good codebases. Chances are they grabbed a library with crap in it.
Doesn't surprise me that one of the cheaper DTF/UV printers on the market has badly written drivers with embedded malware...But their "address" is on their website if you want to head to Los Angeles and bang on the door of a little rented space in an industrial strip.
It seems like they sell in Europe. Luckily in a year or so, the CRA will be enforced. Even people outside of Europe will be able to take advantage of this as a forcing function: Manufacturer doesn't respond? Report the vulnerability to the ENISA, and the manufacturer may have to stop EU sales.