When a player receives a medal on the podium at the Tokyo Olympics, the IOC = International Olympic Committee has approved that the mask should be removed for up to 30 seconds only when taking a picture.
In principle, athletes and related parties are required to observe social distance and wear masks in the "Playbook," a guideline that summarizes measures against infection with the new coronavirus of the Tokyo Olympics.
However, the IOC has decided to allow the masks to be removed for up to 30 seconds so that the athletes' facial expressions can be seen when taking pictures on the podium, and informed each team by the 25th.
On the 25th, the third day of the tournament, Japan won four gold medals, but all the athletes followed this instruction and took pictures on the podium for a short time with their masks removed.