I do not recommend a fluid flush, drain and refill yes, $4300 does seem a bit high for a tranny fluid and filter change, I also recommend checking with reputable independent shops that specializes in Ford vehicles.
Got mine done by mobile service tech and sun visor wiring a pillar, all good. Only recall left is side curtains air bags which probably not get it done, I'll let the next owner worry about it, tech told me they only allow techs 2 hours to complete, he's done several and takes him hour and a...
All 2.3 come with metal oil pan and valve cover, 2.7 oil pan and drain plug are plastic, not sure about RR. Some trims come with metal guard under engine, mine is plastic. Most difficult task of changing 2.3 oil is replacing the oil filter but once you do it a couple of times you'll get used to it.
I did some research after watching the video, there is a filter. For the 2.3l looks like it is part of the oil feed line, you can clearly see it on a diagram. I've never heard of this filter before.
PUP is an outstanding product, M1 and Valvoline are also outstanding. To all of you guys out there overthinking this oil matter, don't worry. Use a high quality oil, 100% synthetic if you don't mind paying the higher price or full synthetic with pretty much similar results and synthetic blend...