Earlier quoted context omitted.
Uh... do you have cash in a money market account? What do you think the "money market" is, exactly?
In the nicest way possible no absolutely not that would way underperform just about everything
But regardless, the point was that all the "cash" you see in your investment accounts (even if you, personally, don't carry any) is predominantly treasuries and other short term high-confidence debt. Everyone owns treasuries, it's only true that very few people "buy" treasury notes.