Yep. As an O-Ring harness, Joque works with almost any flared-base dildo. The other thing to look at is the O-ring size and stretchability - the Joque's is fixed (so you can't put in a bigger or smaller), but copes with dildos between 1-1/2" and 2" in diameter (smaller dildos can be used, they'll just be a bit floppier).
Since Leo is 1-5/8" it's solidly in the Joque's ideal range.
Have fun!