In my experience the people who give shitty presentations with powerpoint would also be perfectly capable of giving shitty presentations without powerpoint.
The article itself supports this as they don't just skip Powerpoint, they skip the presentation entirely in favour of a 6 page memo.
There is a time and place for slides with a few talking points per, but in many ways it's contorted most all meetings into PR events even when there's nothing to sell.
I would also disagree in that its a crutch for the absolute bottom of the barrel presenters, because no matter how bad awkwardly reading slides to the audience is, its better than silence / choking up / repeating themselves / skipping intermediate concepts. Being read to like a preschool child is better than not getting a presentation at all, well, at least most of the time.