I’ve never heard of thumb, index finger and pinkie extended as being a peace symbol.
Sounds suspiciously close to a Van Halen.
I actually think it’s “I love you” rather than “peace”, but I may be wrong on that.
Something like that. Definitely not Satanic. This person also had a page on how the movie “Spiderman” was possibly sporting Satanic undertones because Peter uses that gesture when trying to get his webbing to work.
That’s another conspiracy theory: People thinking that there’s always some racist/sexist/religious/political secret undertones to every movie, even the really stupid ones made for a quick buck.

