One element missing so far in this discussion. In most** light twin-prop aircraft, the propellers are "blowing the wing" and
adding some lift directly via propwash flow (in addition to overall airspeed).
One can be adding (or losing) lift directly by throttle setting, not just by prop pitch and IAS changes.
That cuts both ways - in such a twin-prop, leaving a little power in during the flare can cause more "float" — but chopping the throttle too fast can cause the twin to flop onto the runway as that "propwash lift" around the wings vanishes
instantaneously, even before the IAS changes much.
In the C172, that will not happen much (if at all). Its propwash mostly impacts the fuselage, and the remainder is passing
under the high wing-roots.
**There are exceptions - Cessna Skymaster, Dornier Do28 Skyservant, all-pusher-prop configurations that at most "suck" the wing - (no remarks from the peanut gallery!
), etc.)