Guess WorldTennis got it wrong, as most publications do.
To hit the low skidded slice, you have to take it LATE, almost beside your body, using a weirdo almost forehandy grip (continental, like your serve, wiht a tiny twist towards eFOREHAND. You step into the ball, lean forwards towards the target, slice the ball aggressively clearing the net by no more than 2', closer is better, the ball goes deep into NML and skidds about lower shin heights, dropping quickly from there with almost no spin, or some sidespin only after the skidded bounce.
Takes an aggressive hitting mindset. This on painted cement courts.