I've got that install guide. My wiring isn't the same colours as that.
I found an online video where it says yellow wire. I have a yellow wire and it's in an identical two pin clear plug. When plugged in its initializing. I reckon it's the right one.
As for the warning I'm not surprised healtech put that. They're bound to in order to discourage people from buying alternatives.
I buy lots of Chinese goods and so far I've not died or suffered catastrophic loss from any of them.
Mind you I'm currently in quarantine with a raging fever and breathing difficulties.