I think he means more like Monaco, Brunei or the Gulf States. There are undeniably successful modern monarchies. There are also less successful ones like Eswatini, and de facto monarchies even if they dont formally call themselves that, like North Korea, Togo, Azerbaijan and Equatorial Guinea.
And the king/president/dictator has to have absolute or near absolute power, otherwise I wouldnt call it a monarchy. Like the Netherlands or Sweden arent monarchies. And for places that dont call themselves monarchies,︀ but have an absolute ruler, I count it as a monarchy if the power is︁ handed over to the son (or daughter but thats unusual) of the ruler, when the︂ ruler dies. (And it's always when they die, kings dont deliberately leave power, that's not︃ how it worked historically, and not how it works today)