I don't think watching the lectures is the hurdle that anyone at OMSCS is trying to jump. The program has a pretty low graduation rate, and the tests are known to be fairly difficult, which essentially requires the student to do work outside of class or go to the resources available through GT to understand the material. I can look up the highest quality lectures on any subject on YouTube, it doesn't mean I will understand any of it without the proper legwork.

FWIW I meant the diploma is identical, the actual experience will obviously vary. Some people will get better outcomes online, some will get better outcomes in person.