OTL, means output transformer-less device, does not mean "nothing between the plate and speaker terminal", then it would be NPST or something like that, some OTL designs may use caps or resistors in between the plate and terminal, in fact some highly regarded units may do so.
The ZH-270 is an "OTL" amp in every respect of other "OTL" amps, just that it does it in a very high technology way, or different than anyone else.
The ZH-270 is an "OTL" amp in every respect of other "OTL" amps, just that it does it in a very high technology way, or different than anyone else.