is lipslde a boardslide with wheel drag?

No. A lipslide is a boardslide but you ollie over the bar and turn. Like, if theres a bar and your regular. Then you would come from the left side of the bar, ollie over and land on the rail in the same position as a boardslide coming from the right side.

a lipslide is where you get into the boardslide by putting you back trucks over the rail