I just got a response back from EXR. They said that ALL cars from here on out will have metal wheels. My assumption is that they are relying on a "press issue" excuse, but the advertisement also showed their gons, with metal wheels. To be fair, the MSRP on the gons was lower to reflect the difference in wheels compared to the 4000's. I think they just got a little overzealous with their ads and needed to clean out the last of their plastic wheel bin before committing whole hog to metal wheels. I'm not sure I even care since they're apparently not using FVM wheelsets but I'll probably just deal with whatever they use in the short term. Regardless, they did respond in an appropriate manner and I appreciate that.
Hopefully they won't be going head to head with BLMA on anything else anyway.