sounds fictional, especially the raw stat increase. if anything.. i'd expect shoving more weight down one's dysfunctional rotting stomach would only slow it down
It could also arguably be rescuing estranged goo material from the downed zed. Perhaps this zed becomes oily all over from the absurd quantity of Goo in its system, making it harder to hit (which would fulfill your request for more hard-to-hit skeletal types. Sort of.) Maybe Logrin’s suggestion for the zombie glutton to pause on occasion and throw barfy fits could just be getting rid of the consumed corpses after goo-extraction/rescue?