If they are a forum member, I am sure they have improved by now. All of us admit to having done some pretty shameless welds in our lifetime. It's part of the learning process. Welding will make a dummy of the most coordinated people. It took me 2 weeks to pass a 3 bead, 6010 tee joint test in school, mainly because I thought them so hideous, I refused to bring one to the instructor. LOL
I am betting the person that welded it may not be an aluminum TIG welder, but may be an ace at MIG or stick. When it comes right down to it, we all have our gremlins in the trade. For all I know, he was forced to fix it by his employer. Either way, we all take our lumps from other welders. The guys I came up with were frig'n brutal, but I love em nonetheless. It's after surviving the ribbing all these years it is nearly impossible to be insulted these days and that's a nice place to be in this trade. If that guy is a welder, he will own it and we will all understand how it happens.
Some of the proof of my work I post here is iffy. I leave the mistakes intact and I know other welders notice them. If anyone laughs here, it's in part because we know what the poor bastid went through. Half of us are in this particular trade because it is mostly immune to political correctness and the normal 'kid gloves' routine, at least until us dinosaurs die off.

Miller ABP 330, Syncrowave 250, Dynasty 300 DX.
Honorary member of the Fraternity of Faded Tee Shirts.