I would say those are just coincidence. I mean, look at most of the events they "predicted". Those were bound to happen based on the current situation. Look at how many episodes they have. Maybe more than 500. Out of them, only few episodes predicted something that was actually bound to happen. Once again, those are just coincidence and nothing else. And for the recently predictions, they probably look at what's trending/happening now and makes a new episode and hopes that it is going to happen and people go all crazy lol. The price of bitcoin is supposed to grow and they know that.
Of course, I completely agree with you that any scenes in the Simpsons script are just a coincidence with real events, but still we have to admit the fact that there are too many of these coincidences. For example, this is not only the black president of the United States, but also a large-scale epidemic due to the virus, which began to spread from China. These events were also in one of the episodes of this series. It is unlikely that the scripts are written by some Oracle or fortuneteller, but nevertheless the fact remains a fact and very curious.