I removed the HSD spindle off the router tonight and cleaned out the rust inside the ISO30 taper. It was probably the biggest disappointment on the whole machine as it is a very critical surface. The rust looks a lot worse in the pics than it really was, there is a VERY slight pitting in places now but the tool holders sit in nice and neat. I don't think it will be an issue at all.
I cleaned it out by putting a clean piece of rag in the hole. Then starting with a blunt scalpel knife to get the worst of the rust then used some steel wool, then finally the wire wheel on the dremmel. I deliberately avoided sandpaper as it would have removed the good metal from the precision ground surface. There is plenty of good surface left to make a good contact tool holders so all is good.
I have advised Taney and he is going to sort out the issue in future by putting a plug or something over the hole so the moisture cannot get in when the routers are shipped.
In the photos you can see the four bearings the grip on the under surface of the pull stud on the tool holder at the inside of the taper.
The last pic is with the rag stopping junk from getting inside the drawbar.