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I believe the spindle moulder is used for creating interesting profiles. Kind of like a router bit, with a more complicated shape, fixed to a table and the workpiece is passed across it, which you could use for making (e.g.) skirting boards, trimmings for doors and windows etc.
So I guess he is saying that he can do the job, but the frame is not going to be a great visual match for the door that you've bought because the carpenter doesn't have a workshop with the equipment needed.
It might be worth asking if he has an example of making a frame in this way before. It could well be that he thinks its a sub-optimal approach but you find it perfectly acceptable.
We got a quote for a second hand front door we bought to be fitted in a new wooden frame. The carpenter who quoted for it on Monday said this:
What does it mean?