On that website I linked, it says, something about needing 5 1 litre bottles of cvt fluid, but I've read here that people only get about 2 or 3 litres out.
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Nice, well you obviously read some misinformation or interpreted it wrong. I usually just drain and refill. Pull the plug and get about 2.5L. Jack up the back of the car and get another 1/2L.
I can't remember how much you get by dropping the pan and filter(screen/strainer). If you wanna get even more out pull the valve body out(I wouldn't bother). Not much comes out when you pull the cartridge filter(like I mentioned already).