Nope. In order to be upvoted by an audience of highly techincal readers, I would hope that all one needs is to make a strong argument, or provide something interesting, or otherwise of value. Credentials can be a shortcut/filter to finding something of value. Someone may reasonably choose not to spend time reading something from someone with no credentials, under the assumption that most of everything is garbage. But, after having chosen to read it, the credentials no longer have any bearing. It's either good or it's not.