Man....this is all very confusing, hahaha.
First of all, where'd you get "ski slide" from? A "skier slide" is a regular ole' 90 degree rotation onto a jib where you slide perpendicular to the rail/box then spin another 90 off, back to either forward or switch. Using the term "ski slide" made trying to understand any of this really difficult brother. The trick that Brogan does at 26 seconds is known as a "nugget". Not trying to be a stickler, or a dick, just clearing that up.
Secondly, doing a 270 swap from a nugget would put you into a standard "skier slide". For example: If i ollie onto an urban style flat down box on my right into a right foot nugget and I FS 270 swap at the kink, I'll land left foot forward in a normal skier slide....
Soo....did you mean to say a 180 swap into a left footed nugget? Or, did you mean to go into a standard skier slide, THEN pop another 90 degrees into the opposite footed switch nugget? That'd be tight.
To my knowledge, no one has filmed either trick.