Question regarding 5 3 1 BBB

So, under this program, I first complete my main lifts using the 5/3/1 pattern, then do 5 sets of 10 reps for hypertrophy work. For example, after finishing my bench press with 5/3/1, I reduce the weight to 50% and perform 5 sets of 10 reps. Is that correct?

Someone told me that fatigue hinders motor unit recruitment (which is crucial for strength training), so why does this program focus on hypertrophy work after strength training?