Only they didn't really "make" it – the carbon fiber frame was sourced from Takumi, in Taiwan. On the face of it that's a shame, but it makes sense; when you've got a company like McLaren assisting bike manufacturer Specialized produce a road bike, it's clear that 'pushies' have got so advanced that a company can't just hop in and mold a $10K bike in six months. Beyond that frame it's got a Shimano Dura-Ace Di2 group with electronic shifters, and it weighs 15 pounds.
However, the Lexus crafstmen did polish each frame for three hours, and the bike is said to embody the "principles and philosophy" of the supercar, while the brochure for the bike says it represents "a new chapter in Lexus history." That chapter is still all about rarity, though, since there's only one bike headed for Canada and two for the US.