TBH I don't care how much AI power it has. There is a well defined measure of High Performance Computing performance (which we hate, but there it is), and if you claim to be "Britain's most powerful publicly known supercomputer", and then quote a position on the Top500 and a Linpack performance number then you are explicitly using that definition. (Which, here, does not support the claim of being the UK's top machine).
If you want to compare "AI power", then that's fine, you;'re very welcome to do that, but whatever you claim there is not comparable with any measure used to evaluate and rate the top supercomputers.
If there was an "AI500" list and recognised AI benchmark to use to rate machines then claiming a position in that is fine. But the claim that performance on FP16 (or BFP16) is comparable with double-precision Linpack is just wrong.
Or, if you prefer: you are absolutely right, NVIDIA is making an apples to tangerines comparison, and that is what I am objecting to!