To be honest, I don't think this makes any difference to the wing debate. It seems fairly certain in any case that BoLT Balrogs didn't fly. But that is all that this evidence supports.
Nothing from the Book of Lost Tales can provide significant evidence either way on post-LotR Balrogs.
By the way, what chapter of BoLT is that from? I don't quite recall it - it's been a while since I've read the thing straight through.
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