I watched it a while ago, but the TLDR is more or less that the learning styles (ex: visual learners, or auditory, reading/writing, by doing etc...) are a myth. People do not learn better when we use their preferred learning style. But overall, people do learn better with multi-modal (mixed support / style).
Yep - multiple representations, and interactivity, for the win. It is incumbent on the instructional designers and teachers to construct a process where the learner actually learns the concepts rather than learning processes and using computational resources to cover a lack of understanding.