I once bought an Iceman signature bass consciously strung B E A D (the Sharlee D'Angelo one - fron Scandinavian heavy metallers Arch Enemy) and they had tuned it to E A D G at the factory notwithstanding the outsize strings!
Man, that bass was hard to play coming out of the case
until I realized what had gone wrong! (I changed it to an E A D G set.) Said a lot about Ibanez structural quality that the neck took it without bowing.
Where a player uses such an extreme tuning, not using the correct gauges and not tuning the instrument that way is kind of self-defeating. The guy is a dedicated downtuned rhythm guitarist, he basically plays a baritone Explorer with weird power chords, hard to see who would buy his signature model and play the Free Bird solo with it. It's like someone buying a Lemmy Ric and complaining that it is not really good for slap technique.