Its not an opinion though, you are demanding that they word the message in a certain way. It might not make sense to you but the relationship of Pogba and the club is not only a on pitch relationship. All I'm saying is you don't have to look for many reasons as to why Pogba would get a parting message from the club. He was here in 2 spells, is an academy graduate, gave near 10 years of service to the club and the club also benefitted from him and made money off his name through stuff like marketing, shirt sales etc which helped grow our brand.
They aren't forced to give a 3 letter message or stay silent just to satisfy the whims of a certain section of our fanbase. You have a opinion on his time, same as everyone and same as the club.