Video one is not two backhands.
He's playing a right-handed two-handed forehand and a right-handed two-handed backhand. They probably have it titled wrong in the video because he is (I'm guessing) a lefty.
I play with my primary forehand shot being a 2HFH, so I definitely know what they look like. The 2HFH player still needs a strong 1HFH for certain situations, imo, and the 2HBH player still needs a strong 1HBH for slicing and dropping.
The second video is avante guard, for sure! I strongly believe we will see someone break through with this style, but they won't be limited to "two forehands." They will essentially have two forehands and two backhands giving them a variety potential that we've never seen before at the higher levels.