from what was said, Gobert was sick previously (under the weather with something), then joked around about Covid19, did all he could to jokingly spread a disease he only joked about, we then find out he had it, and now it comes out a teammate of his also has it likely due to the antics of Gobert pretending to spread his germs to reporters and teammates.
Even if it wasn't this new virus, and was just a common cold or flu, it's still a foolish assholish thing to do. And the fact that he made light of it and did in public should, then turned out to have possibly spread it in the process should have consequences. If anyone can reasonably connect contact with Gobert during said antics, that led to them possibly contracting and then unknowingly spreading the virus to a vulnerable loved one at home, and that vulnerable loved one dies because of said disease, Gobert could possibly have some legal liability there. (I'm not a lawyer, but I live in Cali... people are sue happy out here.)
maybe suspension into next season is a bit much, but definitely a fine and suspension for some games this season, and then to be the spokes person for some NBA outreach regarding personal hygiene and minimizing risk of spreading dirty germs everywhere.