Tachibana's excessive knowledge is in DNA, science and medical, but he has some technobabble understanding of internal bodily energy/aura and mental states and such since his transform gear is dependant on it. Don't think he did too much research into taoist stuff, just some general "so what mythical creatures exist and how related to Undead are they" lines of inquiry, so he'll be starting from a very low cultural osmosis level of understanding there. He will be hella fascinated by it. :)

He can offer lots of science tutorials, as well as any mechanics/motorcycle knowledge that's wanted. (Because he's a Kamen Rider and motorcycles are his 2nd true love :D )