Its never revealed to be a fake message. At all. Indeed it’s strongly implied not to be, whilst leaving it as a possible plot hook for a sequel.

I’m genuinely impressed they left the content of Jor-El and Lara’s message to Kal-El is left entirely ambiguous.

Did Lex tamper with it? Superman certainly doesn’t seem to think so. And there’s no on-screen attempt, once the Fortress of Solitude is repaired, to recover and replay the message or analyse the copy Lex had.

That’s a very bold move. It might not be for everyone, but I for one appreciate it. It makes Superman his own man. Never mind what his Kryptonian parents intended. It’s Ma and Pa Kent that instilled him with his morals and values. He doesn’t have to be what Kal-El wanted him to be. It’s a nice, if perhaps overly subtle coming-of-age moment.

I did like when Lex was upset and corrected the good guys that he wasn't trying to kill Superman so that he could take over a country but that he was taking over a country knowing Superman would intervene and use that to get authorization to kill Superman. A real hater this Lex guy.

I kind of adore Ultraman. I'm not sure if he's a direct shot at Snyder but I find it kind of funny he's the entire Death of Superman era rolled up in one. He's a little too Black Noir and pretty obvious but I did appreciate when the mask breaks he's almost a perfect shot of Doomsday in his original appearance.

From there you basically get a fight against the black suit Superman, mullet and all. The bit of red in his hair is a nice nod that he's probably got a bit of Lex in him, though I couldn't help but feel like they really went after Eisenburg there. In any case, he's very much a perfect strawman of everything people think Superman is devoid of anything that makes him Superman and its a character that's been tumbling through my brain all weekend.

I do particularly appreciate that he's well positioned to return as either Bizarro or the leader of the Crime Syndicate in the future.

The Doomsday costume and the mullet, specifically.

Krypto gets attacked by one of the villains and yelps in pain, then it fades out. Superman spends some time worried about him and looking for the dog. It’s revealed that Krypto is okay, and in fact Lex is keeping him under control by having him chase images of super squirrels in a VR tank.

It's never truly injured, but there is a point where it gets subdued in a way that I could see upsetting people sensitive to such things. Lex is a bad man with no real boundaries when it comes to animals (or people for that matter). The dog will be fine. It's Kryptonian dog and similarly invulnerable, but there's a point where the dog's safety does not feel certain. Probably good to let your mom know he'll be absolutely fine.