Not to say that

But this/that is not to say is the collocation.

In your version, the expression lacks a subject.

You might say, "His position is to recommend the treatment for old folks, but not to say that young folks couldn't benefit from it."
In this case you have a compound predicate. That is the same su

"Obviously, (the) older people patients [?] should be getting Orthokine therapy, but that's not to say that (the) younger patients shouldn't be getting it too."



Your use of "the" implies that specific groups of older and younger patients have already been identified to the reader. If they haven't then you should delete both instances of "t

Hi, Avangi.

"His position is to recommend the treatment for old folks, but (his position is) not to say that young folks couldn't benefit from it."

Is this what you suggested, the same subject?

Note: 'But' is a coordinating conjunction which joins two independent clauses.

_________

Hi, MrWordy.

Thanks for pointing out the

meantolearn"His position is to recommend the treatment for old folks, but (his position is) not to say that young folks couldn't benefit from it."

Is this what you suggested, the same subject? Yes - just an optional solution to show that it's not absolutely necessary to add "that is."