I surprised that they tried. Stainless generally isn't happy to be CNC'd and tig welding up something that shape seems like it would be a lot easier. It's just a plate and four partial tubes.

Also, that part is S355/A572Gr50 steel. It's the type they build ships and bridges out of. Some of the datasheets I found for it have warnings about not using it in places that see high temperatures.