This combination in the video only works for easy puzzles but it's safe to assume that medium and hard have their own patterns as well. I'll test it out and get back as soon as I can!
Edit:So I'm still going to test it a couple of times but these are the solutions I got for Medium and Hard Puzzles
Medium=RRURULULLDRDDRRULULULDDDRRULULDRDLUUURRR
Hard=ULULULULDDRDDRRULULULDDDRRULULDRDLUUUURRRR
I also just got the platinum!!!