A floating PoD isn’t a real one, but many, many ones.
Further, by focussing on individual trees, we miss the forest.
The Germans were out by very large amounts of scale - 5 million Reichsmarks is a princely 2.5 million USD, for example. Resources include electricity, manpower, steel, cement, copper and silver and a lot more, is another.
They were not close to anything in @, having a tiny programme that missed the point and missed the bus.
Nearly eight decades ago, when Allied forces and Nazi Germany were locked in mortal combat in World War II, American and German scientists were engaged in
cosmosmagazine.com
Find out just how close the Nazis came to building atomic weapons during World War II, and view the only known diagram of a German nuclear bomb.
www.pbs.org
Fear of a German nuclear bomb spurred the Manhattan Project. But how far behind were the Nazis?
frontline.thehindu.com
“I don't believe a word of the whole thing,” declared Werner Heisenberg, the scientific head of the German nuclear program, after hearing the news that the United States had dropped an atomic bomb on Hiroshima.Germany began its secret program, called Uranverein, or “uranium club,” in April 1939...
ahf.nuclearmuseum.org
Whilst a simple collection of sources on their own isn’t conclusive evidence, their collective weight, and the time that this opinion has been held, is fairly strong. To counter it, there would need to be a comprehensive argument with evidence as to how Nazi Germany was in fact within close reach of an atomic bomb.
Handwavium on the question of electricity and saying that ‘it doesn’t really matter’ isn’t an argument. Now, it is true that they don’t have to follow the Manhattan Project, but piling multiple contrivances upon multiple shifted goalposts isn’t a firm foundation.
Without multiple changes - and I would suggest that they don’t necessarily follow logically from an extended WW2 as outlined in the OP - those fundamentals don’t alter. Multiple independent PoDs aren’t the hallmark of hard alternate history, but of a good ripping yarn or a well crafted story.
Moving back to the topic, even though a Nazi bomb is beyond the horizon of reality for us in 2024, there is no reason in 1946 to give a sucker an even break, from the perspective of the time. This would suggest a concentrated blow rather than a piecemeal approach that could give the Nazis room to wriggle.