Videos demonstrating how to shoot are just that...an entertaining way to see how someone else shoots. But be careful about trying to copy something too exactly, because what works for one may not work well at all for another. Even with experts, if you watch enough video clips of a person shooting you'll see that seldom do they shoot the same exact way every single shot. Sometimes you might even see a 'you MUST do this every time' video training moment, only to later see the shooter not practicing their own advice during actual shooting. Yet, they can still be consistent.
Shooting form demands to be followed...but it really is much more basic and simple than some might lead you to believe. On the other hand, shooting style (as Terry calls it) is you're own. You build it through trial and error, to fit your own needs and preferences. Style (like how you draw and release, for example) can vary quite a bit, even between shots. Form does not. The devil for most of us is figuring out where one ends and the other begins.
With regard to a 'good release' it doesn't matter whether it's static or dynamic as long as in the end the string leaves your fingers cleanly and the arrow hits the spot. Whichever of the two gets you to your best results is your best way. The real question is, WHY does one or the other work better for you?
Looking at cause/effect (being inquisitive about why one approach feels/works better) may help your shooting alot more than simply copying a coached method just because someone said to do so in a video. Also, considering the format under which you do most of your shooting (say, target line comfortable repetition at paper dots, vs. 16' up a tree with a hard angle shot on a cold fall morning at a real live animal) might be another factor worth considering when building your style. Just some food for thought.