uh. this argument is kind of strange and not really a valid reasoning imo.
consider that throughout osu's history, players have been constantly improving.
remember this map:
https://osu.ppy.sh/s/1173 was once considered very difficult, and is now more or less trivial.
similarly, freedom dive was mapped under the premise of being impossible to pass, and here we are with numerous fcs on it.
a bit ago, ephemeralfetish attempted to rank the empress, an 8.78 star map which was also ridiculously hard to play, containing 270 bpm deathstreams; you supported it.
not to mention promethean kings like... exists. which is, as we can see from the leaderboard on that one, significantly harder than this map; one of the highest plays is a 65% acc pass done entirely by mashing.
aside from the fact that this argument has been proven again and again to be invalid in rankability, you didn't really suggest any solutions. should he just nerf the ending ("ending") jumps from being fullscreen? he's already done that, but are they not nerfed enough? is the concept of a high sr 280 bpm map inherently unrankable? please elaborate so he has the opportunity to respond rather than just being slammed into a brick wall that says "too hard, vetoed, bye."