I think here he's referring to the native "instant send" mechanisms of Dash and Iota.

I prefer LN over both altcoin approaches (although I see it viable only for relatively small payments). Dash's instant send mechanism involve a degree of centralization ("consensus" in a very small sub-group of nodes [masternodes]) I don't support - LN at least has the option to be relatively decentralized, although we will see how the network topology will evolve. Iota still has not proven that it can work without the central "Coordinator" node and so should considered, for now, an experiment and not a mature cryptocurrency.