Also, in terms of videos, on the linked site, they are viewing a Pyros Dimas video, and from a purely technical standpoint, he probably isn't the best lifter to watch. Don't get me wrong, I am a fan of his, but compared to the other world-class lifters in his weight class his form isn't really the greatest. His is a clutch performer who thrives on the biggest and brightest stages, he is very strong, but not any stronger than a lot of world class lifters in his weight class, and while his form is adequate for just about anyone, in terms of world-class lifters, it really isn't very good, it's not horrible like Reza Zadeh or Chemerkin, but it isn't textbook perfect. He is one of the greatest weightlifters of all time, but his form really isn't the reason, he just performs the best when the world is watching, and in the Olympics he beats guys who are just as strong or stronger with better technique because he hits what he has to hit at the right time, while others crack under the pressure.
If you really want to dissect a lift and pick out the various phases and watch textbook form, look at videos of the Chinese lifters. Actually the lighter women are best to watch in terms of technique because they are weak as piss and they absolutely require perfect technique.
This brings up the point of inadequate form, adequate form, and perfect form.
The guy who posted the question on FI has inadequate form, ripping the bar up and throwing your back out to muscle up the weight is not a clean, and that type of thing needs to be reworked from the ground up.
With adequate form you clean the weight, but your technique will still prevent you from lifting as much as you probably could, you can be proficient, like Dimas, and still leave a lot to be desired. Also, a phenominally strong freak like Reza Zadeh or Chemerkin (I swear he push presses his jerks, lol) can have form that is absolute shit by world-class standards (in Reza Zadeh's case, just absolute shit by most standards), but being such a strong squatter, puller, and presser allows them to hit big lifts.
For perfect technique, watch a lot of the lighter, weaker lifters.