Great video! Don't you love scoring a neat and exotic piece of gear cheap because of an easy fix like that?

More videos like this!
I would suggest removing everything from the CRT neck (socket, deflection yoke, and edge/corner correction magnet assy), and reinstalling them after checking for mechanical damage.
The yoke generally gets installed tight up against the flared part of the CRT envelope, as far forward as it will slide. being a centimeter or so to far back will definitely cause "neck shadows" in the corner of the screen., where the electron beam hits the glass neck at the extreme edges of the raster.
The 4 magnets correct screen geometry (linearity and/or focus in the corners. The individual magnets are sealed in place with paint, so if you get the whole assembly seated back where it was (attached to the yoke, the mu-metal shield, or the CRT itself?) you should be pretty close for adjustment. Proper adjustment will need a crosshatch test pattern, which the generator self test may be able to provide.
You can (carefully) set the yoke rotation with the unit powered, as long as you grap the insulated parts of the yoke, and watch your fingers.
Definitely looks like the unit took a hard shock front to back. Enough to bust the magnets loose, shift the yoke, and knock the socket board loose. Glad to see that the tube didn't get necked, and looks good as far as brightness and phosphor burn.
Would be curious as to what the interface is between the display and the main bioard. TTL or analog video? Or some proprietary interconnect? Might be a candidate for an LCD conversion if the CRT goes out.