Not a conspiracy, just a rookie safety arriving a second too early and trying to make a play while avoiding interference. If 43 hits Diggs without altering his course, he gets called for pass interference. Vikings ball at the 43 and they have an opportunity to kick a 50 yard FG for the win. Even if 43 is able to slow himself and gather for a tackle, unless he is able to wrangle Diggs in bounds (which would be hard given both their momentum is to the sideline) the Vikings have a chance for a 50 yd FG. The ideal scenario is that 43 timed his approach better and was able to make a well-timed hit on Diggs that breaks up the pass or at least makes the tackle. It was a bad play, but not a conspiracy.
Bell, this video in particular is less than convincing. The guy, Ybarra, says he needed to make a tackle with 0 seconds - Not true, there were 3 seconds left when he caught it. He then goes on to fault 43 for not trying to get up and chase him down. Come on, Usain Bolt couldn't get off the ground and chase Diggs down over 25 yards when he has a 10 yard headstart.