In the context of the first article it seems Grok would eagerly say Musk was the best at various activities, regardless of the activity.

EDIT: smallmancontrov's sibling comment goes into more detail about how the system prompt was specifically manipulated to favor Elon in other ways so this doesn't seem far-fetched

Now that 'tough guy' Chuck Norris has departed this world...

The AIs are looking for new defs for tough.