The author played us all like a fiddle.
So: the first time I ever found a paragraph like the one the GP has quoted, happened on the same site I've ever been on where the autoplaying videos are making my whole system (including typing this comment) lag worse than any other site I've been on.
At least it gave me one good idea for the Extension I'm Making One Day™: watch the CPU and if the current page is killing it and it has autoplaying videos and/or CSS animations, automatically kill both.
In the meantime, I had to close the article as it was unreadable. (Wow, getting my low typing latency back is wonderful!)