You can see the inside if the grinding. It’s basically a plastic clip on cover
Predictive text one piece is longer than the other.
One end is level one end is longer
Mine were done around 5/ 6 years ago, with a similar wood look finish. I have seen no signs of any chips or damage, no botched ends of sills, no poor fit at all, despite having 5/6 years to inspect them carefully. The one problem I noted when they had finished, was there was a couple of mm gap between outer seal and door, with door closed and locked, at the level of the handle, but it was tight up top and bottom. Either the door was bowed in or frame bowed out. I got them back to rectify it.
Looking at your photos, it looks quite an amateur job.
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