That paper refutes very little by using adult humans. Some facial expressions are universal among human cultures and even among primates, and yes, even among mammals.

Liking and disliking facial reactions to sweet or bitter water are universal among mammals.

https://pdfs.semanticscholar.org/a511/cb9d06d0f77132cad2ba5f...

And relevant to the topic of this post and the original article, human babies will in fact smile when given sweet tastes right after birth.