It was a bloodbath yesterday night at Winwing Store *sigh* that's for sure.
To that point:
The warning was there, BUT just on the website and only for the items that will be re-stocked. I myself came across it by accident by visiting the store the day before. As warning there was a countdown for said items. But I don't know how long before the countdown was set. I recall sometime around one week or two before I didn't see any countdowns. May be it was even just days before, so I wouldn't wonder if the countdown was actually set just 24 hours before re-stock.
Nonetheless, everything said above seems to be correct. I didn't see any pre-order possibility for as long as I discovered Winwing... about 1-2, may be 3 months ago. (I'm pretty new to DCS Hardware/HOTAS etc.)
As for yesterday night: as countdown was gone the website/store was down! (I'm sure you're shocked) I couldn't open the store for about half an hour or so, and even the direct page of Orion 2 F-15EX I opened before was not functional after countdown. So I tried couple of times and got lucky eventually. But the first couple of tries at checkout were also bugged as hell and I lost another 15-20 minutes to actually get an order for the Throttle.
All in all it was a nightmare experience at their webstore.
And as of today as I checked, the parts are already out of stock. This all seem to be somehow unprofessional.