DaxMasterix is not a newbie mapper at all, and he surely knows what's right/wrong, or funny/painful to play. The SV change spam you mean is used to increase/decrease gradually the difficulty in both kiai times in Aimai Elegy, so it does make sense.
"No more than 3 SV per difficulty" was only a guideline, as far as I know... Check his maps carefully nevertheless, because he tries to use a perfect symmetry by increasing or decreasing the SV at some points, instead of making those sliders more vertical or horizontal.
It's another technique to map, more laborious, yet valid IMO.