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Contrary to some misconceptions, these SIMD capabilities did not amount to the processor being “128-bit”, as neither the memory addresses nor the integers themselves were 128-bit, only the shared SIMD/integer registers
I would guess they think a PS2 is an example of 128 bit computing.
The PS2 had full 128 bits DMA bus, and full 128 bits registers. IIRC Dreamcast too.
OP’s question is very vague. I would argue that the PS2 was indeed capable of “128 bits computing”, even if it isn’t technically a 128 bits computer.
I’m also pretty sure the comment was tongue in cheek.
I also believe the initial reply was a bit cheeky.