The reeds still look pristine on my P-37D. I haven’t played it much. Those on the Song Lin are uneven in color, discoloured, though not I think as a result of having been played. They look worse than the reeds of other cheap melodicas. I just posted a link to someone’s video on gapping the reeds of the Yamaha P-32D. It nicely displays how good those Yamaha reeds look, and we know they hold up well.
Phosphonium bronze is identified as an anti-corrosive reed material in some melodicas made in China. One site appears to have a photo of the Faux Yamaha, however!