If these Doomsday concept art leaks are real. How did this happen?

I will not directly say anything that was shown in them, for people avoiding them.

Soon as I opened twitter today, first thing that popped up was a post of 4 different pieces of concept art. Then I saw two more pieces of art afterwards. But I started learning there was more, so I quickly started avoiding them. But man what a shame that these got dropped, if they're real.

It's almost on the level of No Way Home bad, with these leaks. They haven't even started filming, and we've already got potential significant, plot details, and characters who will appear. How did they not keep a tighter leash on these? Set photos are of course something that would have happened, and revealed stuff, but seeing these just shows more detailed stuff.

I'm aware that this was unfortunately my own unavoidable fault, because I follow different comic related stuff on socials, so they're tapped into these kind of posts. But it still definitely sucks seeing them so early like this, it made me sad. I just hope they start becoming more tight lip now even more after such leaks. Again, if they are real. Do we know if they are real officially, and how it happened?