Considering Monaco can continue to pay him legally, the chances are he's on the same as he was and Utd are paying the wages in one lump sum to Monaco as an upfront fee. Reporters always change their mind on how they report wages, sometimes they add it up, fairly sure they were doing that with Adebayor's move to City, it was some stupid £80million deal for Adebayor, which was the fee + 5 years of wages they randomly stated as the total cost when you'd usually just report the transfer fee.
It makes more sense to Utd to pay Monaco the money, monaco pay him the wages as usual... tax free wages. British press probably not realising that's the deal and guessing 180k a week means £340k before tax.
Considering Monaco's situation and being able to pay tax free, it would be pretty stupid to not take advantage of that. Makes absolutely no difference to Falcao or to Monaco, it only helps Utd and Monaco have no reason to make life difficult for Utd, in fact if his wages all but doubled they'd likely not take him on loan so it's good for Monaco to help them out(presuming they want to offload his wages which seems a possibility).