I don't know if punter (as in, customer) is related. I suppose buying something is always a bit of a punt to some extent.
Yes it is unfamiliar - it is unlikely that anyone in the UK has accidentally said that.
"i have a lot of different nationalities partaking of my wilderness lodge, and a lot of the younger english ones use punt/play/burn/scam as equivalent."
Given you have a dislike of capitals, I'll hazard a guess at your age (but not tell you). Kids here (UK) don't use words like that, says Granddad! I get a capital G because I say so.
If I had to guess, I've probably replied to a shit AI sigh