I have read it fully now - I agree he had some rough blindspots (like requiring in person salesmen for capitalism).
But my opinion is the opposite: maybe there are some rotten pieces in the otherwise delicious meal. On the whole it's a wise piece; if perhaps too optimistic that people would evaluate fairly the (negative) value that the internet brings in some areas and stick to the better offline options. But that might be a transient state, the future is long (or so I hope).
Are you laughing because we lost most newspapers to garbage online news, because schools are digitalized with no benefits, because social media made us less democratic, or because fake products are sold on the most successful online stores?
For sure he underestimated the impact, but he was not /wrong/. Most things did not get replaced by computers, they were lost to computers.
For sound, it should be the same with a corner of a room, it ~doubles the sound in the vicinity of the corner, hence a ~3dB increase