Now it's getting esoteric.
Unless you tell me otherwise, I need to go 30ft to reach the edge of the platform. From there it's 15ft down. So I'm 5ft or 0.5s fall time short of the floor. But I have 5ft reach if I attack while mid-air and the ghoul should be about 5ft tall. I say I can reach him without dash, but if you rule I can't, just remove one of my bonus action unarmed strikes.