It's not sous vide, the dishwasher just happens to be above the cooking temp for salmon which is a relatively low ~130F. I'm sure you could also do a steak in your dishwasher too, but steamed steak doesn't taste good.
I don't know where you're getting steamed steak from though. There's no steaming involved anywhere. This is for salmon only. You'd need higher temperatures and longer times for steak, which is why it doesn't seem like anybody invented dishwasher steak. ;)
You've never heard of steamed hams? Clearly you're not from Albany.