How do you know? Are you his prep coach? 
You don't know but many do. You can sort of guesstimate just based on pictures if you've seen enough real world application.
It's at least 4 grams of AAS, probably at least 12iu of GH and plenty of insulin. So yes, "juiced to a high level."
There are some individual variations but there are some constants, things like "high" testosterone doses among the heavyweights. Meaning no one does less than a gram and some do several. High testosterone is the base in almost everyone's cycles, then the other compounds are added on top.