From the pattern and other things I've seen from employers, it seems likely to be a response to particular content complaints where the specific content is something the employer doesn't want to draw more attention to from anyone who hasn't seen the initial complaint.
Colleen Oefelein's posts on Gab and Parler are publicly available and appear to be nothing more offensive than reposts of her tweets. I don't think that there is any more than meets the eye here. Her announcement that she was using the offending platforms was enough to raise a twitter mob against her to put pressure on her employer. More here: