> These slides need a lot of work. I'll read the paper later, but the slides really lack context and motivation.

SPJ is an exceptional public speaker, but that involves a lot of talking, a lot of context, audience participation, and a lot of wild gesticulating at slides.

I'm not sure if this talk was recorded, but I am sure if it was the recording will be much better than the slides, the slides are not really designed for consumption outside of the talk context, but rather as a reminder rather than taking notes. At least that's my experience having seen a number of his talks over the years.