I don't think that's how it works, even if the math is right. The article shows the supported read out modes, right? The one with the highest framerate that I can see has 960 fps at 768 X 54 resolution, which is a 16 : 1,125 aspect ratio (Yeah, I know that's not how ratios work mathematically). And this 480 fps mode everybody mentions also only has a 16 : 8 (Edit: I messed up, this should have been 16 : 4,5) aspect ratio unless I'm missing something? If that is the case, I don't find it that practical. Now, the 30 fps at full 33 MP resolution sound quite impressive.So if we downscale from 4K/480 to VGA (640x480) we should get almost 8000 fps (did I do that math correctly?)
Now that is something I would like to have at an affordable price.
And everybody questioning the need for high framerate video might find it helpfull to take a look at the Youtube channel The SlowMo Guys. I find some of their videos to be amongst the coolest content on the site.