Here’s a link to the original article in The Sun. While I still haven’t had my query to Jackson’s management responded to, it looks as though the original story was indeed correct.
When the story ran in The Sun originally, I reached out to Jackson’s publicist who checked with the fighter’s manager, as Jackson himself is currently on hiatus. The response? “His manager said it wasn’t true.” All that said, Jackson would make a pretty kickass Baracus. He’s already got the chain-wearing shtick down, though he’d have to trade up from steel chain links to gold (or at least gold-plated).