You are right of course. I was thinking specifically about the early PIC Microchip compilers for "C" where the weird banked memory and Harvard RISC architecture made the "C" you wrote for those essentially non-portable even to other 8-bit micros. I think the Microchip marketing was very carefully trumpeting C but not claiming to follow any version of the standard though.

And, the of course, the community around PIC's where almost uniformly on board with writing in assembly anyway.