I've let this game play itself for over 24 hours, completing more than 200 runs, and yet none of them got a time lower than 9:19. Although this doesn't formally confirm that it's impossible to get a WR on emulator, I feel it's good enough proof for me.

I made an automated setup, in case anyone is interested in doing this as well: https://github.com/MatheusAvellar/barney