While I've not seen what Silivas said, honestly I don't think it's weird to be defensive about that at all. For anyone it happened to. None of the gymnasts who had their ages falsified chose it, they were all children in repressive regimes. It might bring back all kinds of unpleasant memories, especially as at least some of them also emerged from systems known to abuse athletes.
Even if it doesn't, all of them except maybe the North Koreans must know that others have had medals stripped. The rules don't allow for Silivas to lose hers now, and I don't expect that to change personally, but nobody has any guarantees. It also clearly means many people will think they weren't legitimate winners of whatever medals they won underage, and a few will blame them for not speaking out. That's obviously idiotic but it happens.
And for those who've since emigrated, it raises the possibility of which DOB they used. Maybe they worry it's going to cause them problems if they used the government issued one with the younger DOB on it.