DM is just using another excuse to promote their anti-immigrant (better say anti-Easteuro cum Muslim) stance.
FFP is there for only one reason: There was (and still is a time) which clubs are propped up by unsustainable investments, and when it dried up the club will find HMRC or its equivalent immediately knocking on their door. FFP is designed to prevent that, and only that. Everything else is just a side effect.
Instead, the DM article spinned that into the exact opposite. True, the FFP system is pretty quickly lambasted as being too protective to the big boys, meaning the gap between the have and have nots has widen up. But FFP has never been supposed to be preventing clubs from going up, if they can somehow find a way to utilize their resources more efficiently. Using the loan system is exactly this: with a lower initial outlay, clubs has access to better players, so they can improve while keeping within their own financial means.
We often hear fans dislike larger clubs hoarding players, and loaning is at the very least a useful method to give players more playing time and exposure to lessen its effect, while the risk of the player not cutting it out still remains at the club holding his registration.
If there is anything related to FFP, loans are actually promoting FFP. And what a pity that the system is underused: I would rather propose a club can loan in/out as many as they want, provided that every player registered at any club should be able to play (in the 25-player list, or List B) for a club or another (i.e. loaned out) at the end of every transfer window, or he should be able go to the CAS to annull his contract with the statutory notifying period/clause (basically, a form of modified Webster ruling which, if a player is not able to play between 2 windows he can terminate his contract for a month or so notice, like every rank and column worker in every other industry).
Instead, the whole article is just a piece of anti-immigrant spin. FFP is analogous to British Nationality laws - to that writer British Nationality should only be offered to those who can afford or already had it in the first place. To him there should be laws to forbade people from buying, or like what he see loaning is "cheats" his way onto the British Isles.
p.s. Chelsea's clause on Courtois should be struck down, in addition Chelsea should be fined the maximum "illegal revenue" from the loan, which can be computed from counting how many matches these 2 clubs could potentially meet in a competitive match. The reason? Anti-trust.