21 minutes ago, Smithy said:
That's exactly what they mean: 3-prong, and don't defeat it by tying the ground and neutral together, or by plugging into a 3-prong to 2-prong converter.
I'm sorry for your discomfort. You're quite right that the instructions are oddly translated. I think they're hilarious - but if I'd just reacted with "laugh" you might have thought I was laughing at you.
It's a lovely-looking machine!
And it si upside down in hospitals - in case they fall out. Yelling at the boys when installing the outlets "ground up!!!" Plus they have pretty red covers if "essential" https://www.archtoolbox.com/materials-systems/electrical/groundorientation.html#:~:text=The story goes that hospitals,plug inserted in the outlet.