Is fifth precept included in the Noble Eightfold Path? In the following video this monk said that consuming alcohol is a latter addition to the fifth precept and hence not part of the Noble Eightfold Path. I wish to know your thoughts on this.

https://youtu.be/VI3dT4aXkfM?t=3163
Without watching the video, I think it is a late addition.

It was noticeable when writing this answer that several of those core suttas (MN 9; DN 31; SN 55.7) identify four precepts.

It apparently wasn't among the first of the Vinaya rules either (see this origin story).

I do think alcohol is problematic though, in my experience: better to avoid it.