OP did not directly respond to the dubious claim but you did. Thank you for reminding me that they're claiming this is stronger than concrete. That indeed is du

OP did not directly respond to the dubious claim but you did. Thank you for reminding me that they're claiming this is stronger than concrete. That indeed is dubious. I think the conversation is swinging too far in the opposite direction, however, and many people seem to be writing this off.