Another video is this one, uploaded a couple of days ago
https://www.youtube.com/watch?v=_pehwx1gAnw&t=5s
I've heard it said that the organization were interested in the outcome of the case and filed as 'friends of the court' not to support Jimmy Swaggart but simply to legally express their interest in the outcome of the case. In the video above Jason Zelda shows a seven or eight page submission that the Watchtower lodged in this Swaggart court case. It would be interesting to see that report because from what Zelda is saying it does sound like the Watchtower were supporting Swaggart in believing that their should be no requirement to pay taxes.
If nothing else, the fact that they filed their interest in this case seems to demonstrate that they believed neither Swaggart or themselves should be taxed. On that basis, it could be said that they supported Swaggart's claims and therefore, by extension, his ministry in the fact that Swaggart shouldn't be paying taxes and neither should they because they acknowledged that their activities were similar.