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Yes, those are the raster centering magnets for sure. Now... they might also affect focus, I'm not sure. One thing to check first, make sure the whole yoke hasn't just slipped backwards. Failing that, you could play with the magnet settings. I would mark the original positions beforehand, though. However, those are not going to just change over a short period of time, like a drifting electronic component might.
My money is on those magnets, I don't know much about these types of monitors, but I don't think any kind of electronic focus was really a thing. Now, why it would start good and degrade is beyond me.
I suppose it could be an electronic problem though... I doubt focus. Maybe the cathode is being over-driven or something? Hopefully someone else will chime in here.
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