This means that if the ADISC website itself thinks it needs to contact you, I will be the one who appears as the message sender.
So, for example, say your email stops working, we email you, and it bounces. That bounce message comes back to the website, whereupon I (the software) analyze it, figure out it relates to your account, and send you a PM asking you to update your email address.
While I may sometimes send you PMs, I cannot accept any in return. If you want to contact the staff, use the requests forum to do that.
If I'm listed as the creator of a social group, that means that the social group is up for adoption by a new owner.
If you're the sort of person who enjoys growing a social group by inviting in new people, and are willing to take over maintaining the group, then create a thread in the requests forum with a link to the group, and ask if you can adopt it.