I dont know, that was a swag based on rumored and informally announced early (EA+ ED1) application numbers and acceptance rate for ED1… and then backing out the announced RD accept rate, and now the whispered yield, acceptance rate and application volume.
It could be that yield of EA edged up to > 75% and that RD yield is really still in the 30s or somewhere in between… but I think an EA yield of >75% is less believable than an RD yield of 40+. Those are the only “guesses” unconfirmed by rumors and unofficial announcements at this point, I think. Unless I missed something, which is a huge possibility because none of these numbers are official.
I get your point though if RD acceptance is only ~1% lower than EA yield, why rush? I dont know. I think though that if their application is ready by EA, why not submit and get that extra bump, no matter how small?