Pffffffft
Allied jet technology was no more than 2-3 years behind Germany (Gloster Meteor &c.). Also note that the Allies had an entire industrialised country available to produce munitions, thousands of miles away from any enemy threat, thereby practically guaranteeing an eventual Allied victory from the start.
German discipline/technological superiority was not *so* far removed from the level of the Allies. In the weeks up to Dunkirk, there was much more of a fight than people tend to realise.