Man U are a buying club.
Spurs are a selling club.
Spurs may be better than them currently but that fact is yet to change, just look at the recent outlays, they'll always be a club that buys cheap hoping to sell big. Spurs had such a golden opportunity in the last 5 years to become a top club but they bottled it and will probably always be a selling club because of it.
They finished 3rd in a 2 horse race with Leicester and are the only club to not make a transfer in the summer window. This was during their most successful patch in the domestic league for ages.
He is right they should, and can, pretty easily just go and get him.