In strict legal definitions that’s slightly different due to it handling defined personal data, how its processed and where its located rather than merely “Significant number of UK users accessing the site”. GDPR is also very well written and quite clear unlike the OSA which is vague, with a enforcer that’s already pretty infamous in the UK for being somewhat loopy in how they operate. Under US law and frankly international business law ofcom has pretty much zero mandate to demand what they are demanding of a entirely US domiciled company. Most matters of GDPR in regards to a foreign company will apply to companies with infra and a presence in the EU anyways.

What the UK says here pretty much doesn’t matter in any way shape or form, and if they’re going to ban it then ban it already rather than chasing around with fines and paperwork. I’d still rather this wasn’t happening as the OSA is a massive steaming turd of a law that’ll merely be used to suppress speech.

But yes technically if Hiroyuki Nishimura stepped foot in the UK he might wind up with some flak from it but beyond that this is just posturing.