No it wasn't entirely false however the court felt differently ITTLThe whole situation is weird. The base idea (buff guy with cape and black hair) is absolutely a ripoff of Superman and while Beck and Binder definitely had integrity and did their own thing they were instructed (so I’ve heard) to create a knockoff.
DC was dickish but the claims of plagiarism weren’t entirely false
I also think what DC did with black Adam (having him be someone who would be a hero in the Bronze Age but a thug today) works well and 52s arc was absolutely heartbreaking
and I have plans for Black Adam