Calculating an ideal surplus for muscle gains

I came across this article with calculators for how much muscle can be gained on a bulk based on body size, body fat, and training experience. What do you all think? It seems to me that there was some solid basis for these calculations, although of course this assumes other factors like stress and sleep are in good shape.
https://bodylogiq.org/en/the-ideal-body-fat-percentage-to-bulk/