Interestingly, certain types of welding are not actually that difficult to pick up, and you could get to a base competency with simple guides and fairly cheap equipment and a bit of practice on scrap.
You could absolutely build a perfectly functional bike by MIG (metal inert gas) welding mild steel. Even with little to no experience and cheap equipment.
These days, most mass produced bikes are aluminum because it’s a cheap material and the difficulties of welding it (very heat conductive, hard to get the metal at the joint to flow) are kind of irrelevant in a mass production setting. A lot of people still prefer steel bikes due to the rigidity and durability though.
It’s so weird to see a company with such strong and straightforward brand chasing trends in such a sloppy manner.