I think Slant likely gets less weight because their review average trends so far off the average/consensus range; they average 9 points lower than other publications. It's great it's holding at 94; I honestly think it will stay stable in the low-mid 90s.
I added the reviews from Slant Magazine and Clash Music to the OP.
I'm so shocked that she managed to stay at 94 even with a below-average score (well.. compared to the other reviews, at least) from Slant. I bet Beyonce is probably so happy that her project is being so well-received, she deserves all her success