I only watched the youtube video, but yes, after watching the first link he said that; the context, however, is completely missing. Fortunately, it had a youtube link to a bit more.
youtube.com
He's repeating a very tired old critique, as common from the right as from the left, that capitalism has fundamentally changed and therefore the labor theory of value no longer applies because there's no more "classical" industrial proletariat. As far as I'm aware, Zizek has never bothered to demonstrate this in any kind of article or book; but I never really bothered with him anyway. So perhaps someone here could post it so I could read it. I'd be interested.
Now, the industrial proletariat, as many here should be aware, has not disappeared. Capitalism has recreated it in the former third world and former communist regimes like China. In case people don't know, China hasn't been communist since Deng Xiaoping instituted market reforms in the late 1980s, similar to what Gorbachev and Yeltsin did in the former USSR.
Anyway, in the first world Zizek alludes to the so-called knowledge economy which is something right out of a TED talk so I'm really surprised he's swallowed that uncritically. Perhaps its an allusion to immaterial labor, but that would be confusing since he's criticizing Negri and Hardt when they would advance that point of view as well. In any case, the fact is such knowledge does not generate itself and it does not serve any other logic than that of capital accumulation – and most importantly, it's not the bourgeoisie that are generating knowledge, it's those who are paid a wage or salary to do so.
On another level, if he's referring to Big Data, then, all the same, that knowledge is only manageable because many, many people are employed to make it so. Databases, not to mention the technological infrastructure required, are not built off of anything other than wage labor. So I don't believe his critique is valid in that sense.
Is he correct to criticize those who are literally stuck not only in the 20th century but the early 20th century, like Marxist-Leninists? Absolutely. But this generic "orthodox" Marxist – I've never met one. Perhaps Trotskyists could fill the gap, but then why not say so? Just sounds like him running his mouth tbh.