Alfa 156 2.5 V6 Timing belt change with pump for 549,- Euro at ATU realistic?

Hello, since I bought an Alfa 156 2.5 V6 with which the timing belt has to be made, I have looked around in the normal case I always see prices from 1000,- Euro to 1400,- Euro depending on whether with pump or without etc. But now I have come across something very interesting on the ATU page on the Internet. If I choose my vehicle there and click on the timing belt change tells me the page it would cost me 549.99 with pump without pump even only 429.99 Euro. I really think this is very cheap if not unrealistic, but ATU has such offers for all cars of the package class no matter which. Now the question if I book the online at this price and then drive with the Alfa there to the workshop have to do that at the course also or ? BZW. or can it be that they do that and then in the next one I have to pay double or how does the ? well has shcon who got the information about it. ^^ ^ mfgg