It's almost but not completely the actual plot of Deus Ex, the game which is currently his Twitter avatar.
Deus Ex is one of the most influential PC games of all time and Elon is a known fan. The world it envisions is one where many well-known conspiracy theories are real, including the Illuminati, the Majestic 12, and the Knights Templar. The Men in Black, the black helicopters, aliens and Area 51 are all real and figure in the game's story at various points too.
One of the most eerie things about this game's prediction of future events is the opening level, where the New York City skyline is visible in the background but the World Trade Center towers are clearly missing. Deus Ex was released in 2000 after a 3 year development process, the Twin Towers came down a year later in 2001. The developers actually had issues fitting the entire skybox into memory at the time and the texture had to be reduced in size, and the missing Twin Towers is actually explained in the game as the WTC being destroyed in a terrorist attack.
Most relevantly today, Deus Ex centers around a global pandemic (the "Grey Death") caused by a manufactured nanotech virus which was released by one of the game's nefarious secret organizations (Majestic 12) to bring about global anarchy and the collapse of world governments and result in the leader of the group ruling the world as an absolute dictator. The same organization also manufactures a vaccine ("Ambrosia") which can mitigate the virus for awhile (but is not a cure), with supply intentionally limited so it can go to governments, important industries, politicians, scientists, and intellectual elites. The masses are allowed to die in mass quantities to reduce the amount of potential resistance to the establishment of the One World Government.
While COVID-19 seems unlikely to be man-made, and it is certainly not based on nanotechnology, the parallels between the game's story and what is now playing out in the world are too coincidental to be ignored.