I think the issue is even simpler. When NVIDIA ended his advisory relationship in 1996, he had 90 days to exercise his vested options. That deadline passed nearly 30 years ago, regardless of whether vesting took one year or four.

He exercised the 15,625 options NVIDIA told him had vested. His claim now is that all 25,000 had actually vested, but NVIDIA’s letter gave him the wrong number. The letter was informing him of NVIDIA’s calculation; it did not change the option agreement. So the question is whether being given that incorrect information in 1996 gives him a claim today, despite both the exercise deadline and the statute of limitations having passed.