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I think they're running the software in a second (existing) computer.

Which still doesn't make sense from a redundancy perspective: What do you do when 2 systems disagree? Which one is right?

I guess you could shut it down, but would be better to have an odd number of systems and take a majority result while displaying an error light.

From what I understand the flight computers can tell the pilots something is wrong and/or the pilot and co-pilot can have their instruments from different sensors like airspeed so they can compare and figure out which one is right.

In isolation, yes, but hopefully it's not the 4th issue on top of 3 issues the pilots are already trying to figure out.

There's already 2 computers, they just don't error check with each other. It's one of the core issues that caused the crashes.

Redundant computer is already mentioned in the article.