Was the ‘big lie’ was a strategy developed by Hitler using ‘propaganda’ to promote his agenda?

No.  Hitler defined it as a method used by the ‘Jews’ to bring the German WWI government down.  Later Goebbels accused the English of using it…
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So, there is a ‘big lie’ about the big lie!  In truth, the Nazis, communists and basically every nation in the world has used the technique to promote an agenda.  Most of them didn’t and don’t regard what they are doing as a ‘lie’ because they believe it themselves but the result if the same.

Can we really be sure that what the media and the selected individuals publicized by the media tell us are is not the American version of the ‘big lie’?