My guess is the Army are looking at all options to achieve a reduction in numbers.
Those who are seriously injured & likely to be medically discharged once treatment has finished will, rightly or wrongly, reduce overall numbers. Using smoke & mirrors, it's not beyond the bounds of feasibility that medical discharge figures could be manipulated to appear as 'redundees'.
I know that this is an emotive subject but there will be occasions once full medical treatment and rehabilitation has taken place that no suitable job can be found within HM Forces and medical discharge is the only course left open. Having said that it will only be acceptable if a 100% package of aftercare/support kicks in for as long as it is needed and that may well be for life.