I just had my Sportster Replay get shut off after going for almost 2 years!!!Only one way to find out, call them and ask.
Just because it is active doesn't mean it has a lifetime. If a person didn't have the tuner on even with a regular subscription when they canceled it, then it may still be on from that. I've had tuners that have not been deactivated for awhile after canceling them. I've never subscribed to a lifetime plan.