What's not to get??
All he's saying is that it's difficult to buy the very best players in January. Which is true. Most of the very top players will be still competing in either the Europa League, or Champions League. Is a top, top player going to want to move in January knowing that they'll be cup tied and miss out on half a season of European football? Or would they prefer to wait and see who else comes in for them in the summer?
January is a difficult time to buy any real quality, that's all that Moyes is saying and it's the same as Fergie always said too.
And Moyes is spot on that Man U should be looking to add quality, they've got a decent squad, but there are too many 'squad' players and not nearly enough 'world class' (or even close) players.
The Summer transfer window was a disaster for Moyes, but he was barely through the door in time to have any real chance of attracting the right players.
Give the guy a break.