Maybe I’m a bit thick but I don’t get your point???
The best I can see is that he (correctly) added up the 8 60 uF caps and says that is one 480 uF capacitor.
He is questioning if that is an appropriate value, and I think it is worth questioning.... It' a good deal to hang on one line to the generated leg. But for that size idler, perhaps not so odd, it is however, about a 5.5 ohm impedance, drawing 43 amps (reactive) at 240V.
You may not need that much, but 6% is not bad for voltage variation, you could just leave it at that.
If you want to try it, I would actually disconnect all of them, check performance, and add back just enough of them to get the needed performance with the various loads used. "Performance" being "enough" voltage/current under load, and not too much voltage at light load, measured from the two "through" leads to the generated lead.
You can also put half of what is needed from one incoming lead to the generated, and the other half from the other to the generated as a starting point. Then shift them around if you need to in order to fine tune performance.
Having all from one incoming lead to the generated lead may not be optimal, it affects phase somewhat. Usually the idler has the phase about perfect to begin with. Splitting them makes them more "phase neutral" but they still work.