Equality of outcome would mean that the race/ethnicity/etc proportion of people admitted to Yale would be similar to the appropriate proportion in the general community instead of being wildly different.

Equality of opportunity would mean that if two equally qualified persons of different races/ethnicities/etc have the same chance of getting admitted.

The big issue is that you can't have both, mostly due to various family and childhood circumstances that mean that different groups have different rates of "getting to X years old with qualifications/skills/preparations Y".

For Yale admissions, you can have one, or the other, or a compromise in the middle. You can have a situation that's unfair/unequal according to both criteria, but you can't get both "types of equality" at the same time, as increasing one generally requires to trade off or sacrifice the other.