As I view it, Buttermaker is advocating something similar to Swingbuilder's drill as FP26 noted, also akin to the uptick drill which I use with hitters (I have them smack stacked buckets behind them) to get them to feel the rearward launch. It's a not intuitive but valuable thing to feel. Like most here I've seen throw-bat drills where the bat is thrown forward. Like all drills, it can be good or bad, bad if it encourages a forward push and a feel of the swing being "out in front" of the hitter, good if it helps with the feel of a release through contact that "throws the top hand past the bottom hand" vs. a release that is muscled up or chicken-winged.