The time indicated is way off. 4 hours to replace disk brakes??? He must have gotten tired and gone for a 3 hour nap. I regularly do a set of front disks in an hour or less.
1) Removing a few ounces of brake fluid is something I have never done - and I have never seen any mechanic do it.
2) Spraying the caliper guide bolts with penetrating oil will help free the bolts.
3) The article doesn't mention that the caliper piston will have to be compressed to fit over a new rotor. Use a large C-clamp for this task.
4) Turning a rotor is a bad idea. You end up with a thin rotor that will warp easily. A new rotor is cheaper than the cost for turning one.