Or accept a superficial understanding and fail to see the deeper point. Philosophy might be a good domain to see this happen with - read the words but don’t parse the meaning.
What do you disagree with? Nobody said that reading makes you immune to moving on without understanding.
What they said was that while reading it is possible to pause if you don't understand something and move on when you are ready to move on. That's harder to do in videos or lectures. Do you disagree with this?
“if I don't understand I cannot move on to next step”.
I disagree that you can not move on. You definitely can. So your statement about what “nobody said” contradicts what was actually said.