I guess he's decided on how he wants to play, with natural wide players rather than surplus #10s, and can't accommodate Bellingham, Rogers, Foden and Palmer. It opens him up to obvious criticism if England flop, but he'll get that anyway, so he might as well do it his way.
Burn and Henderson seem wasted selections. Would be better to gamble on players who can make something happen (e.g. Gibbs White).