“Mitigated” normally only works in the positive, i.e. that something has reduced or compensated for problems. Here it appears to have been used as a negative, t

“Mitigated” normally only works in the positive, i.e. that something has reduced or compensated for problems. Here it appears to have been used as a negative, that something has reduced or compensated for benefits. It’s a subtle yet important distinction that will jar any native English speaker. “Diminished” would be a more suitable synonym, but “mixed” appears to match the intent of the whole post.