It’s actually way older. It appeared first as official flag in 1867 for the north German federation, was adopted in 1871 to be the flag of the German Empire and was no longer in official use in1919 (albeit nationalist groups kept using it).
After that, you’re right.
More Info here: https://en.m.wikipedia.org/wiki/Flag_of_the_German_Empire
Even if it were, it weighs 3,4 tons empty. Most EU Citizens have drivers licenses that allow cars up to 3,5 tons max. weight, including driver, passengers and cargo.
It’s impossible to use in the EU without an actual truck driving license.