With the new reopening steps from the Swiss government, publicized a couple of weeks ago, we will most likely see full stadiums at the start of the season in September.
Events for over 10,000 people, however, will only be allowed if access to the events is limited to people with a COVID certificate (this is a way of documenting that you have been vaccinated for COVID-19, have had the disease, or have a negative test result).
As Zentralplus writes, the same applies to players, coaches and staff, this, apparently, the SIHF has decided. The SIHF has not yet confirmed the story reported by the news outlet.