I reckon that's an attempt to stop the post slipping down. Check the clamp tightens enough
Yeah it appears to be a fix for a slipping seat post indeed. The Alter clamp thing tightens properly although you do need to use two Allen keys simultaneously. Maybe he had a drill but no extra key...
Also check the seat post is the correct size.
@PhilDAS started
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I reckon that's an attempt to stop the post slipping down. Check the clamp tightens enough