No, not necessarily. It could just be that those areas were what was the most stressed in that particular lift for some reason. Does it mean they are the "weak link", however? Not entirely. Keep in mind, those specific areas SHOULD be weaker than your quads and glutes, for example.
It could also mean your form needs a bit of tweaking. When I used to competitively deadlift, for example, I was often VERY sore in the calves for some reason. Why? Who knows, but apparently I was attempting to get extra drive from my calves.
My guess is that if you continue to work your core section along with your regular powerlifting training, those sore areas will come along naturally without any extra specific emphasis.
Arttie
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