If the news is an April's fool I think it's a horrible joke.
If it's true it sounds like Yuzu has a stitch granuloma in the abdominal muscolar fascia /muscle, which needs a very little skin cut to be removed in local anesthesia. It doesn't sound much worryng because the stitch is supposed to be immediately under the skin, so it's superficial and not inside the abdominal cavity .
It was worse when he posponed the surgery having an infection in the abdomen to compete in JN, it was a condition that involved the whole body, while in this case it seems to be a very localized , superficial problem /pain.
If it's true it sounds like Yuzu has a stitch granuloma in the abdominal muscolar fascia /muscle, which needs a very little skin cut to be removed in local anesthesia. It doesn't sound much worryng because the stitch is supposed to be immediately under the skin, so it's superficial and not inside the abdominal cavity .
It was worse when he posponed the surgery having an infection in the abdomen to compete in JN, it was a condition that involved the whole body, while in this case it seems to be a very localized , superficial problem /pain.
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I think the reason Yuzuru WD from FT was that he was in Toronto by that time, so maybe someone there had enough power over him to suggest a WD. (his coach, therapist?) 
. I mean, he looks okay (though that's not necessarily an indication of how okay he is). I do kind of think parts of this forum (not just you) is overreacting from a few articles with non-JSF, non-medical, non-coaching team, etc sources.