Close grip pressing is traditionally thought to target the triceps but there's reason to posit that it may actually engage the pecs more, as the closer grip moves the arm and shoulder (depending on scapular motion) across the body to a greater extent, which is part of the function of the pecs.
There needs to be more data on rings training. Particularly because you can attain both a great stretch and a solid squeeze and progressive overload is easy with a dip belt.
You had a recent video that mentioned a similar inward pressure on the bar when doing barbell bench press. I just do this with a French press(I think), two dumbbells squeezed together and touch the bottom of your chest with the top of the dumbbells. This solves the problem of progressive overload as you can increase the dumbbell weight to match your strength. Just a thought. Great video, as always.
Ok let's you skip the part where you lose the grip 😂😂😂😂😂😂😂 It's just another major internet bullshit, you don't have to reinvent the wheel to build the most muscle you can, the basics are enough and multiple studies prove it.