I've never been able to move the star wheel adjuster without first removing it and taking it apart and wire brushing the threads,then lube the slotted end caps the shoes go into with grease or never-seize..
Even on my pickup that had new wheel cylinders put on it 2 years ago,the adjusters were rusted tight already,and I had them all apart and well lubed up!..(I had one wheel cylinder fail in only 4500 miles,and the "limited lifetime" warranty is now been reduced to 90 days by Autozone)..
The self adjusters almost never work in my experience either..even after lubing up the adjusters and everything being in working order..they might work a short time,then they seize again..
I always end up doing the adjustment manually..