I did an enormous amount of research when replacing my deck this summer and BL was top of my list. My experience trying to source it here in Eastern PA was, to put it mildly, off-putting, as everyone I spoke to wanted to, unprompted, spend the first 30 minutes of the conversation telling me how shady their competitors were, especially when it came to claims of domestic sourcing.
I ended up doing a kind of 180 and installing Accoya wood, which, geographically and species-wise is about the furthest thing from BL available, but felt to me like a good investment in longevity and thus embodied carbon, even when accounting for the long boat trip(s) to my place.