The "th" superscript is what convinces me this is a FORGERY. You just couldn't do it on typewriters back then.
The "th" thing is the least of the evidence. The folks at LGF typed one of the memos using Word, with default settings, and got what appears to be an EXACT match.
FReeper IncPen overlaid the CBS "original," and the LGF Word version, and got this 4-frame dissolve:
It is most assuredly a fake.