I found these two vids
https://www.newschoolers.com/videos/watch/852491/Flume-Slide--Mt-Flume--Mt-Liberty
https://www.newschoolers.com/videos/watch/852492/Flume-Slide
Judging just by the 2 clips it seems there isnt enough coverage. I am not from there but with 2-3'' thicker snow base it looks do-able. Idk, looks steep too, and i can imagine there are lots of big "pillows" when you wanna ski where the rock slide is.
I d recommend some rock skis, ice pick, good beer and big balls.