I sorta doubt it. Reason: judging from the website, he’s calculated things pretty exactly, what with three different kinds of strings and an odd-looking harmonic curve. Some while back I asked Pam Bruner about the Vesta, no longer made, a 32-string instrument, whether the lowest string (E) couldn’t be lowered to C. She said no, that someone had insisted on lowering it to D, but that the C would mess with the tension too much. I imagine some harps are more forgiving than others on this score.
But look, why don’t you ask the maker himself? And while you’re at it, find out why he chose such an odd range (with B instead of C as the lowest string). I wouldn’t be inclined to tinker with a harp that sounds as good as that one does (I was just floored by the middle and the bass), and at least you DO have the C two octaves below middle C.