a change in terminology makes sense. eating during a specific window, or structured fasting (not bad), doesn't really fit in with the whole feast and famine eating that grok would have dealt with, but i think the term still works fine.
i do leangains style fasts (daily, 18-19 hours depending on my workouts), but i'm not too strict about it. i pretty much don't eat anything until after work on weekdays because i feel like work ruins food for me, and fasting keeps my energy up most of the time. but on weekends and vacations i really vary the schedule of my eating a lot. i might keep the same eating window in terms of how long i consume food, but that window may shift to different times of the day...and sometimes different lengths, and sometimes i throw it out all together. the variety doesn't seem to help or hurt me in anyway.
i got into fasting with the eat-stop-eat method...not wild about it. it's probably truer to grok's way of eating, but i would definitely get hungry more often. i do, just by chance, have the occasional 24 hour fast and feel fine, but on a day to day basis i prefer to fast and eat something each evening.