I think this pack does highlight a few biases of the wishlist, and while it's a great resource and I feel grateful towards the people who have put a lot of time doing it, in my opinion it should not be the entire basis to chose a line-up for a pack.
A problem with the meta-wishlist is that it only focuses on individual animals species, so when people want a representant of a bigger taxa (e.g. New World monkeys), the vote will get split up (between tamarins, squirrel monkeys, howlers, spider monkeys, sakis....) and will result in a lot of animals in the 10-30 range ; but I think any of these animals would have been better received than the animals in this pack (except perhaps the river hog).
The fact we can't change our vote on the wishlist also introduces a bias - if a very popular species isn't included, but another close species is, a lot of players would be satisfied with the close species and would be disappointed if the popular option is also included later on over less represented taxa. That's kinda what happened here with the gibbon (it stayed very high on randomgoat's wishlist because it was highly requested before the siamang, but when you look at SuzieSky's more recent wishlist for instance, it's clear that it's actually not that requested anymore). It might happen with Linnaeus's two-toed sloth as well - I'm sure a large part of the community (although not everyone) is satisfied with the sloth species we'll get and wouldn't want another sloth species taking the slot of other less represented niches, but it's high on randomgoat's wishlist and it will likely stay there as it's not in the game, in a position which likely doesn't exactly represent the community's current needs and want.