Ha, oh yes they're tested
Like they don't know
1. what to avoid using
2. how to beat the tests
Usually at that level the Man / team with the best chemistry sets win.
Fact - pls wake up & live in the real world - like it or not.
Dude - I know this sport really well (and yes deeply know all the prior drug history of the sport - and yes, its still there).
However, I can tell you, for many reasons, that it is very likely he is clean, and very likely he is not on any special new drug or any sophisticated avoidance protocol. (The Chinese yes - likely super smart drug use and scientific avoidance techniques - and also some countries like North Korea, Belarus, Romania likely taking risks with more standardized drug protocols).
I believe the entire US team is clean (and I know those involved with them relatively well).
So for this kid, this is the result of a combination of good coaching, damn hard grit and training, excellent diet, excellent (legal) recovery protocols (massage, sleep, sauna, heatlighting, jacuzzi, ice baths etc), legal supplementation (creatine, collagen, Vitamin B12, Fish-oils, etc), good genetics (may not look it, but there has to be a genetic basis for how he has such amazing strength to weight ratio, speed, proportions, joints that can handle this type of weight, etc.
And this kid has an amazing mental focus. I have seen him at prior competitions in person. He really is the most unusual quirky guy to look at prior to lifts in the back room, kind of like a nerd / Buddhist monk meditation - so clam, so focussed. (Not sure if there are any clips of this, but I have seen it in person - if anyone has clips, do post. Its quite something to watch).