The evidence is convergent. Multiple independent sources reach the same conclusion, the underlying mechanism is well-characterized, and even the field's most cautious voices treat it as worth doing.
If a male is excessively overweight, he's carrying too much body fat in particular, not too much muscle-- although that can be an issue too, but too much body fat is typically the issue-- so more than, say, 20% body fat-- well, then losing body fat is going to be the primary goal for maximizing testosterone, sperm health, and spermatogenesis.
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But men who are carrying too much body fat who lose body fat, their testosterone increases.
adding fat to this decreases testosterone (~12ng/dL per 1%)
certainly men should be below 20% if the goal is optimizing levels.
Seems that 10-15% is the sweet spot and certainly men should be below 20% if the goal is optimizing levels.