Yup, thats the testbed aircraft alright. As far as I have heard, it went back "home" to rest with the remaining TU-144s after its testing back in 1996.
You can see the Russian flag as well as the American flag on the tail of this TU-144 so this must undoubtedly be the test aircraft. As far as a Texas businessman buying one, I would be interested in hearing more about that. Back when they were refitting the testbed aircraft, I read that there was maybe one other TU-144 that was possibly a candidate for airworthyness but that even it was in pretty bad shape. There were some photos accompanying the article (In Air International) that showed all the remaining TU-144s lined up with peices falling off of them, peeling paint, missing panels, rust etc.