I presume you did not forget your sarc tag.
I am no history scholar, but considering that I read PT109 at the age of 10 and later endeavored to understand more about WWII than just mechanized warfare as a childhood hobby, your history is not aligned with what I read.
Rather, your history seems more aligned with the movie “Churchill” which I’ve never seen, but have read its reviews and choose to never view it.
Reviews which include The Churchill Project, by the way.
https://winstonchurchill.hillsdale.edu/fake-history-in-churchill-starring-brian-cox/
The Germans had little more than river barges to conduct a cross channel invasion in 1940. At least the balance of air power was in their favor at the time although it was slipping.
Britain was already out producing the Germans in pilots and aircraft when the war started in 1939.
By 1943 the Germans had little of a surface fleet left and it was in the Baltic and the Tirpitz in Norway.
They had fled in the 1942 'Channel Dash'.