Once again the Watchtower writers miss one of the key points in their "support scripture" of 1 Corinthians 5:9-13:
(1 Corinthians 5:9-13) 9 In my letter I wrote YOU to quit mixing in company with fornicators, 10 not [meaning] entirely with the fornicators of this world or the greedy persons and extortioners or idolaters. Otherwise, YOU would actually have to get out of the world.
11 But now I am writing YOU to quit mixing in company with anyone called a brother that is a fornicator or a greedy person or an idolater or a reviler or a drunkard or an extortioner, not even eating with such a man. 12 For what do I have to do with judging those outside? Do YOU not judge those inside, 13 while God judges those outside? “Remove the wicked [man] from among yourselves.”
vs 9,10 applies to those OUTSIDE the Christian congregation vs 11-12 applies to actively sinning Christians
Once you remove the "brother" from the congregation, they are no longer "called a brother", and should be treated as do the "worldly" people in vs 9 and 10.