I get science based lifting using these splits
But the split makes such a small difference than advertised its not even funny,
Your workout selection (like the machines you use) and (reps and sets and total volume you accumulate over the week) with progressive overload will make so much more of a difference than the split, The only reason people even advertise this split is because in theory it makes the other variables I mentioned much more likely to happen. but its over exaggerated n yes I read the literature behind training.
Natties will do everything to have a 0.5% advantage