Deindexing a page and moving its content to other domain

I would like to move page's content to the other site.
I know how to deindex this at Google. I just wonder will Google later see this content as unique, on my new site?
I think using 301 doesn't make sense in this situation since the page isn't yet ranked on Google and I didn't build backlinks, but it's indexed. So I would more like to deindex it and use the content on a new site. Does anyone have experience with this?

"Don't" deindex the old URL. Just make a 301 redirect.
301 is permanent redirect. When the new URL is indexed, automatically the old one will be deindexed.

yup, 301 redirect

I have a similar question and not sure of 301 is the way to go. I do not want the content on my existing site but want it on a new site. I don't want the old site to be connected to the new one. I have done something like this before when a site expired I move some of its content to a new site.