I think the idea is that the activation is good but the effect is bad, so perhaps it is like the opposite of regen, cutting your hp recovery in half. That's just a guess. I just squelch them.
What the heck, grep is easy. I might as well check. Seems I was right.
/* Some things slow it down */
if (p_ptr->state.impair_hp)
regen_amount /= 2;
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