Nope he always gave fake silly excuses for invasion. For a start, To justify his invasion of poland(starting WWII officially since Britain and France had to declare war on him as they had no more choice after trying to appease Hitler for years by making concessions) , Nazi propagandists accused Poland of persecuting ethnic Germans living in Poland(same slogan Putin has been using with Ukraine, Georgia and his other baltic neighbors for intervention. Lol). They also falsely claimed that Poland was planning, with its allies Great Britain and France, to encircle and dismember Germany. The SS, in collusion with the German military, staged a phony attack on a German radio station. The Germans falsely accused the Poles of this attack. Hitler then used the action to launch a “retaliatory” campaign against Poland.
Sounds very similar to how Japan also used similar excuses to invade China proper. Lol
Big powers are used to such games, so nothing new here. Excuses have to be made for an invasion after all.