What they mean by intrinsic value is that something has demand outside of speculation. For example, precious metals and real estate have demand even outside the financial world. Stocks, bonds provide income in form of dividends and interest rates, and are legal form of ownership or lending.
While cryptos don't generate income like companies, don't have industrial use, nor give you legal rights, it's just mostly speculation right now. You're gamlbing on a fact somebody's gonna be willing to buy it later, but 99% of price and transactions are purely speculative without any real world use.