Well... I'm gonna keep doing it my way. I have changed my own oil on all four of my 4-strokes & the ONE time I filled per manual, it puked into the airbox.
That said, since then it's been carefully add oil until it's on the 1/2 full mark with dipstick screwed in.
IMO, the manual is wrong, just like it's wrong about the fiddle string track tension setting.