Epic fail

But there's no infinitive, or am I missing something?

A split infinitive would be "To frankly be amazing".

The original post is a split non-gender specific third person copular, or something, like "it's totally fucked" as opposed to the split infinitive "to totally be fucked".

Honestly, these fucking grammarengers...
So, basically, you're saying PWNED.

(Lesson: never take on a librarian in a grammar battle. Even an unemployed one ;-))