This strikes me as being a bit like the old CTC-McAlpine scheme of the mid 2000's, albeit without the unsecured HSBC Professional Studies loan. Basically, prior to training, the training supplier (Wings Alliance) and the partner airline will have come to an agreement that the former will supply x number of pilots to the latter. Wings Alliance then selects the trainees, the airline pays for them and the bond covers the airline's costs in case of the trainee leaving without completing the programme/joining the airline/leaving the airline early.
The conditions attached to bond forfeiture would be worth a look, I do wonder if there is any "performance protection" involved.
If they can get enough partner airlines I reckon it might make the "Big 3" sweat a bit, it just goes to show how big the profit margins are at some of the training schools.