[Does Juns loader support ryzen?]

I don't know if you are still wondering, since your post seems old, but in case you do (Which I doubt) or if anyone else is wondering the same question,  I was able to install it using a Ryzen 5 1500x. I used this tutorial:

 

[DSM 6.1.3-15152 Update 4]

It updated with no problem, on my server, I'm using Jun's 1.02b Loader DSM 6.1.3-15152 to Update 4 on a Ryzen 5 1500x system. 

[Tutorial: Install/Migrate DSM 5.2 to 6.1.x (Jun's loader)]

It installed perfectly! I'm using AMD Ryzen 5 1500x