This video is about the applications of soft/flexible materials in robotics and other hardware. It's not (as I mistakenly assumed) a teardown of the SOLID principles.
I assumed it wasn't about SOLID principles due to the "Hardware Engineering" bit in the title but I can see why there would be confusion due to the capitalization of SOFT and SOLID.
Yeah I was disappointed, I thought maybe I was going to see some cool new compliant software engineering principles.