Now that makes things a bit slightly worse as anyone that has removed a plastic bolt that has been in situ for many many years will know, the head will jut snap off as the threaded section has "flowed" slightly over time as plastics are not very stable.
I agree that maybe the oil will get vac'd out for the usual convenience and mainly H&S reasons, but the drain plug will then get removed to drop out the oil that remains, a oil service bill would prove/disprove that theory in as much as you would get billed for a plug.
My wife has a 2015 Polo 1.2TSI and the additional text on the oil service worksheet does point out that vac removal of oil is not to be used - or words to that effect. This vac/don't vac thing seems to be changing with time I think.