I am not sure what was said on the video, but I have a couple of comments.
Cleaning the TB is an important maintainence item that should be done every once in a while (once a year or every other year is plenty). On many Nissans, if not done correctly will result in a check engine light, this is what happened to me.
As shown in the video, open and close the throttle plate by using the gas pedal. If you manipulate it by hand like I did, it is quite likely a check engine light will come on soon. Something electronic. I had to do a lot of research on other Nissan forums and use a specific pedal dance sequence to force the computer to re-learn the air flow parameters in order to clear the code.