I don't want to defend LLMs and generators (which are cool but still a long way from true AI). But it's not like people don't suffer from the same problem -- perhaps not on basic arithmetic, but on many complex problems.
And just to clarify, what the article referred to as "basic math" wouldn't be that easy for a human either.
One of their main examples is checking whether 19997 is prime; I really don't think that the probability of me doing that correctly without a calculator is that close to 1.