Epic bro science. The peak contraction with a straight bar might be slightly better, until you get serious problems with your wrists.
Apart from this; I'm a strong believer in unilateral arm work with dumbbells, sometimes combined with resistance bands for constant tension.
Not bro science it's what's worked for me over the years...
For me this is the "squats of biceps" bothered my wrists in the beginning as a beginner. Nearly 10 yrs later close very close to 20 cold ... And 20inches pumped... Natural .... No bro science , brother just trial and error.
Also I never once said it was the only movement for biceps , for the most part now I use Dumbells , prone dumbel curls , spider curls over the opposite side of the preacher etc.
So no not bro science....