His accent is the "broadcast accent" that was cultivated at the time. If you can lay your hands on a copy of Peter Weir's The Year of Living Dangerously[2] you'll hear a young Mel Gibson switch between his normal and a broadcast accent for his scenes in the recording booth.
[1] https://www.imdb.com/name/nm1467242/
[2] https://www.themoviedb.org/movie/11541-the-year-of-living-da...
"Sanders' CNN reports on Nitinol, a new metal energy conversion system won the US Engineer's Award for Broadcasting Excellence. His follow-up articles in Science Digest were translated in German and republished in Japanese by Japan Times in their annual selection of the world's best science reports. Sanders is working on a follow-up article and an update documentary for world release on new and startling disclosures on the origins and potential of Nitinol. )...
No worries, I got your meaning.