"All" those themes? He addresses some of Star Wars' most obvious lifts (Stravinsky's Rite, Holst's Mars), but the main theme is NOT ripped off of King's Row - the first bar-and-a-half is the same, then it goes a very different direction. Only someone with no ear for music would say otherwise.
I can't take anyone who quote Adorno seriously. A pompous crypto bolshevik who was alternately stating the obvious or talking out of his arse (more often the latter). And to say no serious composer would write a film score except for money is an argument he would have known is fallacious (if he'd known anything about classical music). Great composers wrote lots of their music on commission (Haydn practically all of it). The reason great composers who had no talent for opera (Schubert, Schumann, Beethoven) still attempted the genre is that that was where the money was.
The video misunderstands what Adorno means when he says that composers reuse standard devices to get emotional effects. Of course James Horner used similar music in different films - all composers have their "fingerprints" that appear in work after work. What should have been shown is DIFFERENT composers using the same musical devices for similar scenes.
"The question of originality" - this is definitely an issue in film music (in all music, in fact, and in all art), but simply pointing to motifs that have been reused doesn't make the argument. Composers (and every kind of artist) have been doing that since forever. It's a way of acknowledging and rethinking earlier ideas.
The idea that, before computers, film directors didn't hear the score until it had been finished is false. It was standard practice for the composer to play the music to the director on the piano, explaining how it would sound as they did so.
To say that Zimmer is just writing rock music shows ignorance. If you are familiar with how real orchestral music sounds, it's obvious that Zimmer does too (and a argument by a guy who has written a couple of game scores on his PC doesn't really counter this).
Use of computer generated sounds and "atmospheres" is not inherently bad.
Notice he had to cut away from the Man Of Steel scene before the music developed with actual melody and chord sequence, thus disproving his argument.

At the end, the argument basically boils down to "Computers are bad, m'kay?" But I'd say a poor workman blames his tools. Or as more techy people might put it, PICNIC ("Problem in Chair; Not in Computer") or EBKAC ("Error between keyboard and chair").