DJ Chill will be a part of the Tech N9ne live show. That doesn't exactly translate to being signed to Strange Music. Look at Grant Rice and how long he performed as one of Tech's hype men, and he was never signed to Strange Music. Look at how long Kaliko performed these same duties, and was only officially signed a few years ago.
It's possible that Strange might have signed him on some kind of "Live Performances" contract, but the message that was posted on Tech's Twitter doesn't specify that Chill has signed anything. He me be doing the Rock The Bells tour (or future tours) on a Pay-Per-Appearance like arrangement for all we know.
i always knew tech n9ne was a group, not just 1 rapper