Shouldn't it say "presentation slides are <judgement>", it doesn't seem like the point specifically applies to PowerPoint. (also anecdotally having a bad presentation with or without a tool doesn't matter, having a good presentation seems to help having visual aids and mediocre presentations would be helped if they stopped following terrible advice)
This is hardly a new revelation. Edward Tufte, whose books about the presentation of data are well known, wrote a thin pamphlet around over 15 years ago that was essentially a rant against the use of PowerPoint presentations. See: