You have been visited by the Foot of Shame, an arbitrary profile restriction earned by users who do not select an avatar for themselves. The restriction on setting your own avatar lasts for one month, after which, you need to private message @yawning sneasel to receive the privilege to change your avatar again. The privilege will not be returned without asking.
I know the "proof" article was a load a garbage, that's why I said that no one should bother reading it. It's so heavily delusional with an equally delusional comments section that it's not even worth reading via archive.li for laughs.