So what is stopping him? I didn't think a Unicom needed CASA approval. Or is still a case that he is providing information that he is not legally qualified to provide. If he were to stick to that which a Unicom is authorized to provide I would imagine he would have no issues. You hint at a ASA/CASA conspiracy, ie details deleted from ERSA etc, but in truth it seems it is more local politics at play out there. Info in ERSA is provided by the AD OPR (and that is who removed his details) so obviously they don't want his services associated with the airport.
And he wouldn't be provided forecasts. Unless he is an Accredited Met Observer, the weather advice he can legally offer to pilots is extremely limited.