You can call it what ever you want, that only makes you look bad. Try reading instead of posting, then you would understand just how desperate the real situation was.
"The Royal Navy's Home Fleet in World War II", James Levy Chapters 2; 3 & 4 touch on the difficulties in detecting single and groups of surface ships.
Churchill " The second World War" Vol 2; Chapter 14 covers this problem related to Sealion. In point of fact Pounds worse case scenario had 200,000 German troops landing in smaller groups around most of the UK along the lines of what happened in Norway. So not a huge invasion armada landing in one place, but many smaller groups landing in different ports, than any one central command can possibly deal with.
Since the RAF couldn't sink much of anything, the Germans didn't need air superiority over each port prior to or during any overnight invasion. As was the case in Norway, the British would be unable to mount naval attacks against all ports, but would have only some success in some ports.
You do know that only one out of ever 3 ships in the British coastal trawler fleet were armed, with one WW-I gun plus a couple of AAMg , while the rest were ASW vessels with ASDIC and D/C, armed with only machine guns. These were no match for the German "Vorpostenboote", that usually sported two 88mm WW-I naval guns plus modern flak [ usually 1x37mm and 2x 20mm flak early in the war].
O'Hara's "The German Fleet at War, 1939-1945"; Chapters 3 & 6 Cover the RN coastal forces through 1942. Even when enemy groups of ships WHERE known to be in waters through Ultra and were detected mid channel by RADAR, it still took 6-12 hours to actually intercept them and often such intercepts attempts failed in the early years do to ineffective command.
Face it our forces were incompetent through the first years of the war, and it is only by miracles we survived long enough for Hitler to make his many mistakes, like invading Russia and waging a war against the worlds super powers combined, to say nothing of taking over dictatorial directing of the war effort.
One of these days you people will learn....but not today <evil grin>