I saw the tweet in question and took it as the usual kayfabe Tweet Dixie makes once or twice an Impact.
If Sabin's knee is still a problem, to the extent that it's keeping the Guns off TV and out of the ring, then why were they on last week's house show loop and were just announced for next week's house loop? Surely if they're capable of working 10 minute house show matches where every report I saw mentioned them having strong matches/performances and made no mention of Sabin favoring his knee, then they can work the usual 4-5 minute Impact match and cut promos. Sabin was a tad hesitant in his two return matches, but even then, he was better and more over than Rob Terry, Crimson, Morgan, Garett Bischoff and many more guys who've gotten more TV time than the Guns so far this PPV cycle, and that hesitation seemed like something he'd get over with a few matches under his belt. Shelley's still healthy and a strong promo and can certainly compensate for Sabin right now.