Probably for the better rod ratio (i.e., rod length : stroke length) and its resultant reduced internal friction due to less piston sideloading against the cylinders, and the increased piston dwell time at TDC and BDC with its attendant advantages in completeness of combustion and control of preignition.
Long-rod 225 builds are well known to work well even in near-stock configuration. You don't seem familiar with them. That doesn't mean the idea's nutty and stupid and dumb and ungodly and all the rest, it just means you're not familiar with them.
And it's kind of a distraction, anyhow; his engine isn't running poorly because his rods are too short.
