the perspective not have shifted

[Flogger]

Hello,

I'm wondering why the author has used a plural aux verb [have] to refer to a singular entity [perspective]. The displacement of have and not is also my question. Could you help me?

The original post:

"Devin Way, who plays the jock heartbreaker Brodie, told me there “was no way we could cast people of color and the perspective not have shifted.”

My version:

the perspective not has shifted.”

the perspective has not shifted.”

Watching ‘Queer as Folk’ but Craving ‘Heartstopper’

 

[tedmc]

I think "have" is not a plural verb, but an infinitive verb, as in "the perspective not to have shifted".