If a bunch of foreign surgeons rushing into your country is no news for you, then I have news for you. Also they may just learnt how to use photoshop. And he has a doubler too.
There could be thousands of possibilities. and it could be mixture of facts, truth, half truth, half fake, pure fake or whatever.
More importantly: https://www.cnn.com/2020/05/03/asia/north-korea-gunfire-south-dmz-intl/index.html He seems to be back: https://nypost.com/2020/05/02/kim-jong-un-surfaces-on-state-media-with-mark-on-wrist/
They don't necessary lie, they just don't share. He obviously had some kind of surgical procedure, probably heart related, we just don't know how serious it was and how well he is right now. Also the possible line of succession may not be well laid down, so there could be fight for power. (let's say sister arrests the uncles before Kim's death get out)
Why didn't he say anything though? He always says something. Maybe it is a double, voice-prints are pretty accurate, they're very hard to fake. Just a random thought....
S. Korea maybe? I dunno. That said however, as I pointed out last week, if he is dead and there were to be a power grab among whatever factions exist there, I suspect we'd see the markets jump around a bit. Other than that you're right. The speculation (one way or the other) is a fun distraction though, things being what they currently are and all.