The negs come out wet and have to hang to dry. They don't scan them wet. They scan them when they print them. If you don't print and don't scan, the negs don't go through that process. If you scan, the negs go through the same mechanical path as they would if you printed. On a Noritsu machine where the enlarger/printer is integrated with the film processor, this may seem to be 'processing and scanning at the same time' but it is not - the scanner is just built in to the box, is all.
Some of the newer Fujitsu minilabs are also printing digitally - meaning that they scan the neg just to print - whether you want scans or not. There is no optical enlarger in the traditional sense.
But you should notice the rows of film strips hanging up to dry. Ask them if those have been scanned/printed yet. I believe you'll find that they have not yet been scanned or enlarged/printed. What I do by asking them to cut and sleeve only is to cut short the process - after drying, they don't feed the strips back into the machine.
I don't know of any machine that scans negs while they are still in the soup or even recently emerged. I could be wrong, but I went to Noritsu to look at the pdf manuals for their current machines, and I don't think so.
Best Regards,
Bill Mattocks