He might be right, I don't know. But Times Roman is not a new font. See below:
Stanley Morison born 6. 5. 1889 in Wanstead, England, died 11. 10. 1967 in London, England typographer, type designer.191314: works for "The Imprint". 191418: is sent to prison as a conscientious objector.
191921: works for Pelican Press and from 192123 for Cloister Press in Manchester. 192330: co-editor of "The Fleuron" magazine with Holbrook Jackson, Francis Meynell, B. H. Newdigate and Oliver Simon. 192367: typography consultant to the Monotype Corporation. From 1923 onwards: book artist. Designs covers for the Victor Gollancz publishing house. 192430: works for Cambridge University Press. 192960: typography consultant to "The Times" daily newspaper. On 3 October 1932 the first issue of "The Times(TM)" set in Morisons new typeface, Times New Roman(TM), is printed. 193551: published the history of "The Times(TM)" in four volumes. 194547: editor-in-chief of the "Times Literary Supplement". 1960: made a Royal Designer for Industry. Fonts: Times(TM) (1931), Times(TM) Ten (1931), Times(TM) Eighteen (1931), Times(TM) Central European (1931), Times New Roman(TM) (1932, with Victor Lardent). Publications include: "Four Centuries of fine print", London 1924; "The Alphabet of Damianus Moyllus", London 1927; "The calligraphy of Ludovico degli Arrighi", Paris 1929; "The English newspaper, 16221932", Cambridge 1932; "First Principles of Typography", Cambridge 1936; "A tally of types", Cambridge 1953; "Typographic design in relation to photographic composition", San Francisco 1959; James Moran "Stanley Morison", London 1971. * TYPOGRAPHY An Encyclopedic Survey of Type Design and Techniques Throughout History by Friedrich Friedl, Nicolaus Ott (Editor), Bernard Stein, published by Könemann Verlagsgesellschaft mbH.
Times is a trademark of Heidelberger Druckmaschinen AG, which may be registered in certain jurisdictions, exclusively licensed through Linotype Library GmbH, a wholly owned subsidiary of Heidelberger Druckmaschinen AG.
Times New Roman is a trademark of Monotype Typography.
Stanley Morison - Font Designer of Times, Times New Roman, Times Ten
As I read it, the font did exist and was used in set type, but in was never a typewriter font in the form that it is seen in the documents. It was apparently part of the original Mac fonts in 1980, then adopted by MS as well.