I think he’s got a good point but is taking his rational soccernomics schtick a bit too far.
It's just not an immediate priority, surely.
We need to sign a good left back. We need to sign a good centre back. We need to sign at least one good centre mid and possibly two.
It's not ideal to play some of these out wide. Some of them will almost certainly be off. But we've got Lookman, Walcott, Bolasie, Mirallas, Sandro, Sigurdsson, Vlasic and DCL who can all play out wide to some degree.
If we've got a limited amount to spend on fees/wages, we'll have much better success if we get players in the areas we're actually short.