No, there is an important distinction between independence and autonomy. A majority of the protesters support "one country, two system", they just want the two systems to be preserved.
Not really. And they are asking for the terms of an agreement made in 1997 to actually be honored. It's not like they are coming out of nowhere with original demands here. The demands boil down to something akin to: stop trying to fuck us over on the promises you made to us and the world!
It has nothing to do independence or not, but demanding CCP to keep its promises to Hong Kong people and using the usual legal framework now in Hong Kong to bring justice and peace back to the society