Cant confirm that… only a user that tried the 20xx on Linux, still there’s plenty of free apps around for flashing, now do they have support for this mode? We shouldn’t expect that, but i can confirm Linux support for the CH341A device and here’s a recent project shared by a forum user, of his work here:
IMSProg - universal i2c / SPI / MicroWire linux programmer for CH341a devices - Special Topics / Other Tools (not BIOS modding related) - Win-Raid Forum (level1techs.com)