Sorry, but just HODLing is not passive income (at least I interprete it differently), it is just speculation that the price will increase forever even if you take out parts of it regularly (otherwise it would not be an income, because as long as it sits in your wallet or whereever you can´t buy anything with it). But a pure gambling on price is not an income strategy, but speculation.

With passive income usually something is meant where you passively get something (like your example with the dividend).