The Have Cots have pushed a grown sun, which was grown from the previous episode, as well as earlier in the episode all done for the sake of a challenge requiring to manipulate the heat.
For reference, the increased sun size is calculated here, after it was enlarged by a laser. This episode had the sun grow bigger than that before the Have Cots pushed it, all because Blocky reflected the sun’s rays with a mirror causing it to get hotter and bigger. So no, I believe this is not Calc Stacking.
Sun: 109.5 px/4632903296.7 meters (See calc above)
Wider sun diameter: 219 px/9265806593.4 meters (AKA double, so just use the sun diameter above and call it its radius)
(4/3)*pi*4632903296.7^3 is 4.1653195e29 m^3
Density of the sun is 1410 kg/m^3
4.1653195e29*1410 is 5.8731005e32 kg
Now the GBE
(3*(6.67408*10^-11)* 5.8731005e32^2)/(4632903296.7(5-0.5)) is 3.3126975e45 joules/33.126975 FOE, or Solar System level
But if you are curious as to how fast the Have Cots pushed it, here it is.
Enlarged Sun: 408.5 px/9265806593.4 meters
Distance moved: 93.5 px/2120814973.03 meters
Timeframe: 0.1 seconds
2120814973.03/0.1 is 21208149730.3 m/s, or 70.74277275614452x FTL+
Since this went at FTL speeds, we assume GBE. And since this was done with 5 members, that is divided by 5 (even if it went FTL to the point it goes infinite beyond this point and impossible values, so assumed GBE as I said)
33.126975/5 is 6.625395 FOE, or Large Star level
In other words, BFDI VS Persona is now a thing
Oh yeah, and the LS to push the sun took the same members, so divide by 5 for individual LS
5.8731005e32/5 is 1.1746201e32 kg, or Stellar. That is 59.058187323976312655 solar masses, consistent with Four being able to move Black Hole, who weighs 20 solar masses.