while it looks dodgy (and it may well be), i have two pitons that I once removed. the first one had no visible rust. we rotated it and it came out with hand pressure, with only ~6mm of rock-biting metal before rust had pretty much eaten through it. the second piece looked somewhat similar to your picture, and we had to use a biner clipped to a hammer on it for ~2 minutes before it came out.
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