They exercised 15,625 options of the 25,000. The OP sent $781.25 to NVIDIA. The remaining 9,375 options were not exercised, they expired 90 days after April 16th 1996.
Only in hindsight, 30 years later, has the OP realized that the other 9,375 had vested due to ambiguous wording in the agreement. The article is about the 9,375 that were not exercised.
I think this is a typo.
While no one's hands might be clean in this, at the end of the day the party with the resources and expertise is equipped differently.
It might not hurt to get some more opinions even if they end up in the same place.
Putting aside the fact that any claims here are almost certainly time barred after 30 years, ostensibly, your attorney explained to you that because you had the grant in your possession, claiming that you reasonably relied on the company's statement about what the grant said would weigh heavily against any misrepresentation or fraud causes of action in a lawsuit.
Might as well sue.