Welcome to the club.
Anyways, the phenomenon of Satanism-- which carries many strong connections to witchcraft and devil-worship-- existed long before LaVey decided to use the name as a label for his personal beliefs.
Therefore it shouldn't be terribly surprising (to say the least) that some other self-described Satanists might choose to define the word differently than LaVey's codification.
In any case, most "Satanic" groups are poorly-run jokes that usually don't last a week. However, it sounds quite miraculous if this group was able to stay running for ten years. My hat goes off to them, devil-worshipers or not.
«Recibe, ˇoh Lucifer! la sangre de esta víctima que sacrifico en tu honor.»