Those are just proposed trades. Actually did use the trade finder for some players to see what the "best value was" and they just ran it as a rumor mill.
As for the trade itself in real life. No way they would trade Murray but as for a fit between Jokic and Allen it would actually be a very good one.
Allen is athletic and can defend well in the paint for defense. Can guard 4 as well and a great help on sliding over on defense. It would be hard for any team to try to pound it inside on them when they play together.
On offense Jokic does like to play at foul line and extended at the start so for paint it would give Allen free roam. Plus can you imagine what a pick-and-roll would be like to have Jokic on the ball and Allen setting. Who is going to help downlow and if so you got Jokic who is easily the best passer as a big man. So yes in real life I think the pair of them would be great together on both sides of the ball.