Yeah, LaVey paved the path for Satanists. And it really comes down to whether or not a religion is eligible for Tax Exemption from the IRS, when we discuss whether or not a religion is recognized by the Feds.  I am not fully informed on how many sects of Satanism are granted that status, I do know the LaVey's Church of Satan is Tax Exempt, but they do not take advantage of it.  
I disagree with you on that the invocation was designed to create shock value.  The person is coming from The Satanic Temple group (Different than the Church of Satan).  These are their tenets: https://thesatanictemple.com/about-us/tenets/
This group has been working hard to ensure religious equality for everyone in this country, and shouldn't be dismissed as trolls or rabble-rousers. They have a legitimate stance, and no matter what religious or spiritual background you come from, their campaigns are worth taking a look at.