It does literally refer to penis size. Hiding it behind the word “energy” is just obfuscation. It reminds me of racist people defending the N word by saying, “there’s black people, then there’s Ns. Black people are fine, Ns aren’t.”
You’re just kicking the can down the road. It’s the exact same idea, phrased differently. You just wanna say “small dick” and get away with it, that’s all.