Have never heard of it damaging any kind of wine. I've used it frequently with no ill effects. I would only worry about using too much, so add small amounts, post fermentation, and taste as you go.
I agree that it won't "degrade" apple wine but the significant acid in apples is not citric acid but malic. You might want to consider using malic acid if you are making an apple wine... and you might want to use 71B as the yeast as that yeast has an affinity for malic, metabolizing some of it into lactic acid. (NOT an MLF process - no bacteria are involved)