Searching for "IBM PC Memory Shift software utility 1984" returned no useful hits for the software described that way early on the article.
As a 1980s developer I wonder if that may have been a reference to Borland's Sidekick launched in 1984.
* https://en.wikipedia.org/wiki/Borland_Sidekick
Or was Memory Shift an actual TSR swapper I simply never encountered?
Brilliant, thanks for that - DECEMBER 1983 tracks, there was an explosion of TSR programs and utilities at that time.