I think he's saying 10 hours total on 195. If his smoker only runs 195, it will take 10 hours to get ribs up to 195. I did 3 racks a couple weeks ago and we switched our brand of lump charcoal and had temp control issues. We had a hard time going over 210 or 215 and it was a solid 6.5 hours to get it done. I would normally smoke between 225 and 250 and ribs usually just take a few hours, but these that were at a lower temp for 6.5 hours were great. I wouldn't use that as my preferred method, but it works.
I don't think he's saying the internal temp on the meat is 195 for 10 hours. That would be a disaster.