Of course in the marginal cases. But even simple restrictions greatly reduce liability. And anyways running afoul of gdpr will not affect you much if you don't plan to do business in the EU
But indeed, you are correct that geoblocks reduce liability.
Either way, I asked my lawyers if I had to answer, given that we had zero revenue coming in from Europe. They said no, I didn't for this kind of request, but they could easily send me a more vehement request that I did need to answer.
I ignored the EC, and didn't get that second letter.
BTW, my lawyers are smart enough that I had the only search engine threatened by but never sued by Perfect 10.