Being “in Christ” is not the same as being “transferred into Christ’s spiritual body”
No one argues that when we sin, we are “transferred into Adam’s body”
Jesus currently has a “spiritual body”, according to scripture. We cannot inhabit His body, therefore we cannot be transferred into His body.
It is very poor theology, at best, and tends toward heresy at worst.
Peace to you
It’s a union in the spirit. I’m guessing your thinking is colored by confusion with the physical.