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...
If it does, it will be the first example which has. It was always a shit design as a clamp whether it was an Alter, and Integralter or an Angel, and it can only have got worse by having half the circumference welded to some other tubes.
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...