I remember checking it out when I saw that tfwiki listed Inferno as a Wrecker.I do think he becomes one - he's happy to follow Springer's orders during Time Wars and afterwards, and that blurb from #221 definitely clinches it. It's just that there's no explicit point in a story at which he goes from Xaaron's voice of reason in the "Cybertonian Autobots' advance surveillance unit" who doesn't count himself as a Wrecker, to being accepted amongst the Wreckers.