They don't have to. The problem is that they said to investors repeatedly, "Sales are up due to increase in gaming demand", when they actually knew that a signficant portion of the increase was due to cryptomining.

So what the SEC is fining them for is lying to investors. If nvidia didn't know how much of their sales were to cryptomining, then there would be no fine. If they did know, and did share that in their reports, there would be no fine.

It is their job not to mislead investors about how their products are used.

This is not a fine for "You didn't know how your product was being used" but "you knew it was being used for crypto but reported to investors that it being was gaming"