I haven't pulled the turbo off, but I don't see how it can be taken out from the bottom. There is a lot of stuff in the way that would have to be removed, and I just don't see it being possible to reach through from the bottom to get to the turbo in the first place. From the top, it looks like you just have to take off the TMIC and you can get to the turbo; the hose at the back of the TMIC leads to the turbo I believe.
If they really told you they did that, then either it's the silliest way to remove the turbo or else they just don't know what they are talking about.