What makes you think it isn't Tom?
What are patterns based on? And where is the mathematically based CGI image of a flat Earth that seems to be very elusive.
I think that astronomers and mathematicians have a hard time simulating systems with more than two bodies. There are plenty of people who think it is possible, or who link us to various visualizations and programs which might not be based on a full gravity simulation, but I can't seem to find any statements in the official story telling us who solved it. The stories all seem to say that it's a difficult problem that was never solved.
It's interesting you mention this, if you recall I linked you to a simulation of 3 bodies (sun, earth and moon) where you could manipulate in real time the velocities, trajectories and mass of the bodies while they orbit;
https://phet.colorado.edu/sims/html/gravity-and-orbits/latest/gravity-and-orbits_en.htmlAll of this is based on maths and physics (and not predetermined keyframed animations) but I don't have to tell you that you might be sceptical about what's really going on in the code. As it happens, all the code is on github for you to check for yourself what's happening;
https://github.com/phetsims/gravity-and-orbitsIf you don't fully understand (which is fine, no judgement) I'd recommend getting someone you trust who does understand to explain it. I haven't fully gone over all of it myself and it's does have a fair few third party dependencies which should also be listed and on github. You could also find the people listed in the credits and maybe ask them about it for more info but to anyone reading this please don't harass them (disclaimer).
Feel free to see if there is actually any foul play going on and if you do find anything that would be 'faking' it do tell, I'd be interested to find out too.