I didn't see any confusion about Miles Morales being this new black Spider-Man that wasn't Peter Parker when Into the Spider-Verse came out and that did fine. And outside of racist asswipes like The Quartering, I doubt people are going to be confused or turned off by Superman being Black, especially when this is a reboot. If anything, a POC Superman makes this more interesting and stand out from almost every other major Superman adaptation made in the past few years. The creatives already attached are already pretty solid, so as long as they get a really likable and charismatic actor for Superman (and say what you will about DC, they seldom mess up when it comes to casting), this will do just fine.
This reeks of the whole "Ariel can't be black! She needs the red hair" nonsense