I can't see the videos so I don't know what the tecnhique is (they have video blocked at my office).
One escape I really like if the guy doesn't have a tight mount (most MMA fighters I've rolled with don't because they are more concerned with punching you in the face) is I will quickly put both hands on the hips, buck up as hard and high as I can, as I come back down I hold them up with the hands on the hips, and shoot the legs back through and take guard. Now if the guy has a real tight mount that escape won't work and he'll just stay stuck to you, but it has worked well for me against a lot of people...if it doesn't work then it's back to the old faithful shrimp escape.
I think MMA guys underestimate the shrimp escape to be honest. If you can break down their posture first then you aren't in any real danger of taking a knockout blow, and you just have to be quick with the technique...if you are quick enough you'll be back into half guard before he even knows what you are doing. If he's posted up high then I'd buck then go to the shrimp escape because he's not going to be able to hit you quite as well with his balance being thrown off.
That's what I'd do anyhow.