I finally reviewed this and a couple others from the same PTs. I knew my shoulder mobility was reduced, but until I actually tried to lift my arm overhead as in the video, I had no idea how much. I cannot get my arms straight up. At all. They veer forward at probably a 20-25 degree angle. Where the guy in the video could get his arm past his ear... mine is about where my nose is.
I think this is beyond my skills, as I don't think the stuff in the video is applicable in my situation. When I lift my arms up, it's not my tricep that's too tight. My pec major/minor isn't really keeping the arm from rising, either. It feels like the actual joint has a stopping point built inside it. There's no pain when I do that. It just stops. Both arms are about the same.