I wouldn't worry -- just because someone doesn't communicate well on social media, doesn't necessarily mean the site is badly-run. For example, I know some sites where regular players / marshals answer the Facebook messages, as they're on Facebook a lot more than the site owners/operators.
A quick search brings up their Facebook page, which lists thesiegeproject.com as their website.
https://www.thesiegeproject.com/info says:
Not every site has an amazing site or social media team -- it's not unusual to find sites or links out of date, or pages not having the most up-to-date info -- they're focussing more on playing and running the site than anything else, and tbh some folk just don't "get" how important accurate online info can be, especially for prospective/new players.
Hope that helps 😊