No, Card does not explicitly declare that in the quotation I posted. (Did you mean elsewhere in his review?) He's saying: It's a hostile reading if it's skeptical rather than "with belief". It's also a hostile reading if it's forced rather than voluntary.

You probe his definition by asking, If someone reads it skeptically but voluntarily, does that count as hostile? That's a good question. I don't think we have enough information to answer it, because Card does not state how to weigh skepticism and forcedness against each other.