Keep in mind his ASI in that old bird may be MPH. But it's still too fast.
I went out last night and purposefully slipped the hell out of the 182 with 40 flap. Night, runway waaaaay made if the engine quit, use the slip to slough off tons of energy, straighten out at 10', hold it off... Let the flaps do the rest... Was fun. Made the 1000' marker turning base right at the runway end. I'm sure it'd freak the "stabilized approach" true believers out, but was stable and full rudder on the high side from the beginning of the base to final turn all the way down to the runway. I wished I had more rudder.
Depends on which STOL he has installed. Some are not that effective, thus my plea that he go find the frakking POH addendum or at least the required STC paperwork so he could find a reasonable book number... OR... Go find out at altitude. There's method to my madness.