Plyos can effectively be performed following weights. The caveat being that the parameters of the weight session are carefully regulated in order to ensure the complex method is capitalized upon (tonic followed by explosive)
Now, based upon what we’ve seen from Barwis it would be safe to assume that the concept of the careful regulation of the preceding tonic load is a concept that is foreign to him, despite his ludicrous claim of having the most scientifically backed program in the US.
Lastly, you are too kind to localize your criticism to Barwis as I have seen and heard enough to state, with certainty, that training programs such as his are much closer in proximity to the rule, versus the exception, in this industry.