Gotta agree with KTMax.
I think it was discussed in the other thread, but I'd be more worried about the average shop messing up the frame change, (misrouting lines, incorrect torque on fastners, missing parts, etc.) then I would of a welf repair performed by a competent welder.
I would guess that KTM is just covering their butt, as IMHO, there are a lot of guys that call themselves welders that I wouldn't trust to let touch my worn out pickup muffler, let alone a bike frame. Just my .02
Österreichische Motorräder und deutsche Autos. Wie wundervoll kann das Leben sein