nop this is a super buff, look at hu tao. I have done the calcs and I can easily reach a ratio of 70 crit rate and 300% crit damage with 80em and 120% er (some rounding). To give an idea of what my relics are:
flower: em 61, cdmg 6.2, crate 6.2, er 15.5
feather: hp% 9.3, flat hp 299, cdmg 18.7, crate 7.4
hp sands: em 23, def 63, crate 5.8, cdmg 14
hydro goblet: crate 8.6, er 4.5, atk 33, cdmg 14
cdmg circlet with no good subs
so yeah you can get some insane build on him specifically bcs he has so much cdmg and his set gives so much crate