I'm sure this isn't serious. :)
The content policy mentions affiliate marketing:
Spam. Users that do not publish meaningful content, use deceptive means to generate revenue or traffic, or whose primary purpose is affiliate marketing, will be suspended.
Wether this rule applies depends on the specific case. The user profile you linked certainly doesn't violate it.
Disclaimer: I am just some guy, and this is the way I read the content policy. If you have any concerns that a user is violating any of the rules, contact Stack Exchange and they'll take care of it.
See also Rules for Profiles on Meta SE and a What to do when a user's profile is advertising websites that are 'off-topic' on Gaming.