Perhaps Peter A. Walter VI hasn't revealed this because he doesn't want The Spine to know about it just yet. He doesn't think he's ready to transition.
Weyland Industries is a much older company than we've been led to believe.
Check out the logos for Weyland Industries◊ and Walter Robotics◊. Both companies are headed by a scientist named Peter who's eccentric to say the least. Both use technologies that verge on indistinguishable from magic, seemingly out of nowhere. Both companies make robots.