I lol'd at that video, I could be wrong, however;
The thought of lactic acid being transfered from one place to the other makes zero sence.
So I train legs, do some calf raises inbetween sets and I'm going to have only achey calves tomorrow? Don't think so some how.
All this method is going to do is tire you out as Zach said.
Bodybuilders are clever when it comes to getting bigger, utilizing complete muscle isolation, the importance of negatives and maximum contraction, but they come out with alot of shit too.
I'd love to be corrected about the lactic acid being "transfered" somewhere else in the body, I like learning, but for me it makes no sence.
Also, stretching doesn't remove lactic acid.
Lactic acid is a waste product, and how do we get rid of waste? e.g. human waste, we flush a toilet.
To get the same effect in the body, we just have to get blood into that area, the oxygenated blood will enter the muscles, deoxygenated blood will leave, taking any waste products with it to be got rid of.
How do we do this? Either just every day activity or active recovery.
This isn't to say that we should do a set of the bar inbetween each set of bench, we're training, and should just focus on our next set.
But in a couple days, 5x10 of the bar or light dumbells will help get blood to the chest and speed recovery.