I think you underrate it. It’s much the best thing I’ve found so far on the foundations of SP. Perhaps it’s time to update it (or incorporate it in BAMI).
The BAMI section on SP is weak. It covers terminology and the algorithm itself, but completely misses the section on concepts. B comparison, the BAMI section on encoders is excellent and the section on TM is non-existent. Somebody has some work to do.
Sorry, but popular videos don’t do it for me. I have the framework, now I need answers to specific questions to fill in gaps.