It didn't go in backwards it went in sideways. There is nothing to prevent you from doing that if you try. It is a design flaw. The contacts should be on the narrower edge to prevent that. Such as the SD card. There may have been good reasons why it was designed that way at the time, but if somebody put that design on my desk today I'd reject it in a heartbeat.
I do not own a 7DII.
That said, any other Canon body I have used that uses a CF card will not allow full insertion of the card if the female end is rotated 180* and insertion is attempted.
Yes, the CF card goes in a little bit, but it stops. All I can muster is about 1/3 insetion if it is attempted incorrectly.
It is impossible to insert the CF card with the female end up (holes out). The end opposite the holes is wider in the narrow dimension.
There isn't much of a visible difference in the slots on the narrow sides of the CF card, so one of them may be worn on the card itself or the guide in the camera is out of tolerance.
I suspect that it is much more likely to insert the card on an angle, bending the pins in the camera. I damaged a card reader this way.
For the OP-
I would certainly try to get the repair warrantied without any lengthy details or "fabrications". It very well could be a design problem and not your fault.