Wow, I gotta say that is a weird failure. There shouldn't be nearly enough force on the striker in that direction to cause that kind of failure and I can't see any obvious flaws in the steel. Is there any possibility that the part got dropped or hit somehow while it was out of the gun?
I don't see how polishing could cause that kind of a failure although it is pretty obvious that it's been polished way more than it should since you can see the copper strike coat showing through the plating in at least one spot.
Glock is very anti-polishing based on what I hear in the armorer courses. However, it does surprise me that they would deny warranty service on this kind of a breakage due to polishing being detected.
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I typically just polish the connector and the trigger bar and not the striker.
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Probably smart. The striker is the third most expensive part of the gun--frame-slide-striker. So it makes sense that modifications should be done to inexpensive parts rather than the expensive ones.