It means they are physically well enough to do any activities they want to, including playing hockey. The only obstacle left is controlling the exposures to other people.
The histrionic worries about permanent damage of any significance in an asymptomatic case is an oxymoron. Just because I can detect that the person previously had an infection doesn’t mean there are symptoms that affect that person’s daily life. Any respiratory virus can leave permanent effects. They just happen rarely and people are largely ignorant of that. Many people who have been dismissing any comparisons to influenza are failing to acknowledge how widely influenza can affect the body (cardiomyopathy, encephalopathy, etc) and that permanent damage is possible. In that respect, Covid is similar to influenza, and metapneumovirus, etc.
If a dude hasn’t recovered his sense of smell, he didn’t have an asymptomatic case in the first place!