Nope he said practically right angles . . . to be inferred that it wasn't 100% . . . 2-B talks about the tilting of spin axis of the ball also mentioned in 2-D-O more in 2-E. . . homer understood that all divots were down AND OUT . . See 1-L . . . maybe not exact according to Jergenson . . . but he was certainly sniffing it if he didn't have it.
I think the tilting of spin axis of the ball and the divot been down and out aren't enough for your claim about Homer and the d-plane , from what i have read about the d-plane there is alot more to it than that. Seems a bit of a leap.