is the Red Hot and Blue bbq still in business?

Yes

The one in Plano still opened and thriving, I enjoyed my meal a couple months ago. Very niice casual atmosphere.

I think a couple of them have gone out of business in the past few years but there are 4 or 5 in the DFW area still open. I was there about a month ago, so unless they've closed since then, they are still open.