If you were around in the 1980s-1990s, you may remember the obsession with low-fat everything, and finding ways to make “sinful indulgences” into something “guilt-free“. Note the deliberate choice of words, and that we still use that type of psychological framing around food today (and have been for a long time, even prior to the era in question).
The “low-calorie swap” in 16-42: Easy Lime Pie is cottage cheese, which was all the rage in the 1970s as a “healthy” option, but could still be found in a lot of recipes throughout the 80s and 90s.
I feel like even Simply Delicious didn’t really know how to make this pie sound appealing–do you think halved grapes as a garnish can be considered something notable? You can definitely tell this particular recipe was aimed at the dieting/low-calorie crowd.