This would only be a problem if their original design when built with correctly supplied material will also fail.I think it's fair that they are doing a redesign as well, as one of the flaws of the original design, even when built to spec, was that the two-part design could conceal damage/breakage, which led to the poorly supplied part to become damaged over time without anyone noticing.
Without disassembling the bike, maybe not. BF themselves say the weld marks may not show through. It's for reasons like that professional manufacturers (the ones who life-cycle test new designs before selling them to the public) visibly mark safety recall related replacement parts.I'm thinking it would be not too hard to tell a single fabricated piece versus two welded together. Wouldn't there be weld marks?