They frequently state that RPG rule books include poison recipes or methods of summoning demons, etc. This appears to be a misunderstanding. A very few games have printed spell incantations from folk and ceremonial magick, but most do not. Note that neither the player nor their character actually casts a spell or practices magick . The player simply describes what the imaginary character is doing.
Gaming is basically an adult version of make believe.
It does not promote actual black magic or manipulative magick.