The tell will be in how vigorous they proceed.
FRegards,
The ACLU sometimes takes one of these little nonsense cases so they have something they can point to when they want to claim that they are not an arm of the liberal Democrat Party.
I think the ACLU is in this fight in order to contrast with the anti-american Ward Churchill situation.
The communist founded ACLU NEVER takes any step unless if fits in their far left goals.
This professor is probably tenured and in zero danger.