Can't be true about the milk not getting digested- think about cereal that is supposed to be mixed with breast milk.
I never waited an hour, when ds was younger he ate his solids 30 min after a bf, now it's even less time between (because he's not drinking other liquids yet). I think as long as they are eating their solids it doesn't matter how long the time between is. The reason for the time between is to make sure they are hungry enough for the solids.