I am not an expert, so be kind, but I think you got a thing or two wrong:

- Germany imported close to 110bn m^3 (https://www.statista.com/statistics/332218/gas-trade-imports...)

- a typical big LNG tanker has a capacity of 266,000 m^3 ( https://www.wartsila.com/encyclopedia/term/lng-tanker)

- 110.000.000.000 / 266.000 = 413,533 trips or 1133 tankers unloading every day.

Against the 90m m^3 "whole world fleet capacity" that's still a factor of 1222, so every single LNG tanker would have to do the USA <-> 4 times every day for this to work.