There is internal diversity between Sunni Muslims. The most common/accepted legal rulings are by the four legal schools: Maliki, Hanbali, Shafee and Hanafi. Some Sunnis broke away from those schools and are Salafi, which that particular website is. Salafi thought is promoted these days by the government of Saudi Arabia, but most Sunni Muslims today still adhere to the four legal schools I believe.

I'm not saying that the website itself is extremist (don't know never used it), I'm saying that the interpretation is so in this specific case. Also when talking about 'sharia law', sunni doesn't tell you much it's the jurisprudence part that's relevant and in the first link to the scholar you mentioned it say he follow the hanbali school of jurisprudence which is the least popular among sunni and the most extermist, for a long time it was not even deemed a legitimate one, the reason it still exist today is because of wahabism that sponsored by Saudi Arabia's money make it possible. To go from this to saying that 90% Muslims support this view is very dishonest.

https://en.m.wikipedia.org/wiki/Hanbali_school