A large sockpuppet ring has been caught adding citations of Stephen Wolfram's works to Wikipedia: https://en.wikipedia.org/wiki/Wikipedia:Sockpuppet_investigations/Badtoothfairy
A typical addition: equivalence of the Riemann hypothesis to a tag system (https://en.wikipedia.org/w/index.php?title=Riemann_hypothesis&type=revision&diff=1011413368&oldid=1009272577), a trivial corollary of Minsky's proof of universality of tag systems.
They've been going at it for years, so it will take significant effort to clean up. Technical information that might point to who did this (e.g. an overenthusiastic fan or corporate publicists) is private.