What he is saying is not wrong, but i do think it’s the wrong answer to the question he was asked.
Not mentioning production on a question about transition to socialism is just a plain bad answer.
It’s not clear to me from the clip that he was asked any question at all. The question he states at the beginning could plausibly be purely rhetorical.
That said, it would not be surprising if he were to stress the struggle against counterrevolution but had little to say about the development of productive forces. Sison is a Maoist, and Mao and his intellectual descendants are much more voluntarists than they are stagists.