This is true for liquid options. Startup options are not liquid, there is a chance they’re illiquid until the company folds or is bought- and in an acquisition of a struggling company they’re likely to prioritize higher share classes before common stock gets to see a piece of the price.
What? These are public companies; short-dated OTM options have > $0 value only in volatile markets. But these companies don't pay employees in options.
Edit: I read the link and it appears to apply to RSUs as well. What I said about options is true but RSUs, different story. I’d sell those for sure.