Well, this is another case of incompetent generals blaming Hitler for the débâcles...
When Hitler asked if the Luftwaffe could supply the pocket, as it had done a year earlier at Demiansk, colonel general Hans Jeschonnek, chief of staff of the Luftwaffe, immediately said it could. Göring agreed.
If the C-in-C is told by his sub-ordinates, the ones who know their business, that it could be done and he gives the order... How can Historians still blame it on him?