Yes, the convention even used the expression:
"We would not associate with such inactive ones, even if no congregation action had been taken"
Now as cobweb said above, they did say "anyone sinning", but we KNOW that in the minds of witnesses, failing to attend meetings due to learning TTATT is THE BIGGEST SIN in their minds...
So, basically, if they think you have "left Jehovah", and yet have had NO "action taken" by elders, you are still to be ignored.