Yup. Liquidity isn't something you need to care about if you trade something listed on an exchange, at reasonable volumes (neither very tiny nor enormous). If nobody else wants it the market makers will automatically take the other side of any trade at the listed buy/sell price, and keep the difference, that's their job.

But Bitcoin, BBS stocks, weird instruments that aren't listed anywhere, those you can only sell if you can find a buyer, if there is no buyer (or no buyer at the volume you care about) then the "price" doesn't mean anything at all.