Oh! Both the Avast 2014 and 2015 uses the Avast 9 server to update VPS and program updates. Didn't know that. I hardly do manual updates but didn't see the server name ?
You have to look deeper than that as there isn't just one server used for VPS updates that couldn't cater for the 200+ million avast users
If you try to do a manual download of the full data base you will see there are three distinct VPS databases and there would be a different virus definitions update function to cater for the differing VPS types.
This also isn't really a security warnings & notices, things related to the avast program should go in the associated Avast Free/Pro/Premier sub forum.