This is not the first time unconfirmed rumors have spread on social media and news outlets. It is important to take into consideration that North Korea is a secretive country that controls the narrative through State controlled media.
TMZ first reported on the leader's death in April 25, 2020
https://x.com/TMZ/status/1254103393481527296
President Trump actually reported himself that Kim Jong Un was in good health on September 10, 2020
https://x.com/realDonaldTrump/status/1304038348772855810
Today's posts lack any evidence, mostly calling the claims a rumor.
UPDATE: South Korean social media accounts are sharing photos of Kim Jong Un
https://x.com/nknewsorg/status/2112308947789214011