If the Berning folks might be stretching it a bit to call their amp an OTL, what about companies, like Tenor (I believe), that put out a solid state amp that they described as OTL? This was absolutely true, but, aside from a few solid state amps like models produced by McIntosh, all solid state amps are OTLs (low output impedance of transistors makes transformers unnecessary).
I remember when Allied used to write up the receivers in their catalog back in the early 70s. They referred to their circuits as ITL/OTL and maybe with good reason at the time. A lot of solid state amps back in those days employed input transformers as phase splitters to the output section!
These days though OTL generally refers to a tube amp, not a solid state amp as its no big shakes with solid state in that regard.