Two things can be true: The message is good, and the messenger is also hypocritical.
Technically, there was no ad hominem fallacy. RcouF1uZ4gsC just argued that Khosla is a hypocrite.
Technically, there was no ad hominem fallacy. RcouF1uZ4gsC just argued that Khosla is a hypocrite.
Under a less charitable one, RcouF1uZ4gsC was discrediting the message by using the messenger's ``ethos''.