Everything. That article is all over the place.
He talks about punk rock, Joan Jett and tape trading, without ever really tying any of them into his topic. I read the article and can't figure out if he thinks those things were positives or negatives.
He contends that home taping came about in the 80's, when clearly it predated that. I was taping stuff off the radio as a 12 year-old kid in 1976. Had I been older, I almost assuredly would have started even earlier.
He then jumps to the Riot Girl stuff, even though home taping was old news by the time that genre appeared, no earlier than the late 1980's. He also never expalins what it has to do with his topic.
Then, he essentially blames the marketability of alternative rock for rock and roll's downfall. I guess he was happy with Billy Joel and Bon Jovi.
The whole splintering of rock and roll into different factions has been going on since at least the late 1960's, when FM radio started playing album cuts instead of just the hits. His whole premise is silly.