But another to not know the definitions of words you are using when you should know that? Can you say "I have a million dollars in the bank" when you honestly believe "a million" = 1000?
In both categories of law, there is a subset of offenses that fall under "strict liability" — for which you can be punished regardless of your state of mind when committing the offense.
Fraud, like most criminal offenses, requires establishment of mens rea (knowing wrongdoing), so Sam is incorrect in saying that financial misstates are "felonies" on their face. But once you've become an investor you can bring a claim of breach of fiduciary duty (a tort) — rather than establishing that the CEO intentionally misled you, in this case you only need to show that they breached a "duty of care" — essentially, "you should have known".
IANAL and I have no knowledge of the business/financial/contract end of things. I do know I've signed quite a few "due diligence" and "reasonable effort" clauses. I don't know how legally defensible they are in situations like user reporting when it's not specified.
How those responsibilities translate over to criminal / civil law would be a question for a lawyer. I think Sam's use of "felony" might be meant to get people's attention. Even finding yourself in an argument with your investors over civil liabilities probably means you have huge reputational issues that could kill you among the investor community.