"the upper body is lifted and the lowest part of the spine is stretched downward"
Yes, but that doesn't contradict what was said about standard posture - the lower ribcage still must not be allowed to lift due to lack of abdominal tone. Instead, the lower front of the ribcage needs to be held firmly down to the center, at the same time as the entire upper body is lifted as a unit - stretch is good, breaking is bad.
The big difference between latin and standard of course is that in latin you settle into the hip creating turnout, buit in standard you always dance on it because turnout is counterproductive in standard.