The quick answer to anyone discussing 1A challenges to bans on gatherings is that there is a very easily defensible need for blanket bans on gatherings and that it is perfectly consistent with 1A to include religious gatherings in that ban. The only thing which makes it start getting confusing is if there are other gatherings allowed. Allowing people into stores and the like is not included in that.
Some would argue, the Constitution gives us the right of freedom of religion, even if other gatherings are not allowed.
To stop religious gatherings, more then one criteria needs to be met.
There needs to be reasoning with scientific backing to close religious gatherings. It would be hard to sue based on this, meaning, to get a temporary injunction and have the lawsuit move into to discovery phase. Because there are no hard facts in the actual lawsuit to legally warrant so.
That's why, its possible they are being sued based on other hard facts which do have legal ground for for a temporary injunction.