Maybe this is a stupid question but is this called hip slide?
Nah, he is mostly refering to Hip Action 7-15, but he does also incorporates
the Hip Turn 7-14 (slide) to transfer weight. The Hip Action mainly pulls the Loaded Power Package to Release Point with no independent motion of the Arms until Triggered, as well as establishing Pivot Lag (Pivot Train) 6-C-0 to resist Impact decceleration.