No they didn't, at least not in my case.
I was a pre-order and my account was not debited at or near the time of order. My card was only charged once the products had begin shipping. Not to be confused with when my order was shipped.
Of course the very definition is of a 'pre-order' is something that isn't yet available or released. I'm not sure why you seem to have a bee in your bonnet about DJI. Have you been burnt by them in the past?
No particular bee in my bonnet - just following them for the past few years and finally taken the plunge and ordered a Mavic Pro. There's been lots of chat about DJI taking orders (and payment) for the Mavic when they have, now acknowledged, not had the capability to fulfil those orders. Their recent email to all early pre-orders confirmed this. In my case, order mid October, confirmed shipping in 7 - 10 days, payment taken, now confirmed that production is delayed and shipping likely to deliver 7-8 weeks later.