Jesus is still that child. There He is, that is the One Isaiah pointed towards. It still rings true. The fact that Matthew used "virgin" here demonstrates the lack of clarity and certainty about this word, but even if Matthew led us down an incorrect road, the meaning still rings true. It does not run counter to the original message of Isaiah. To be honest, there are other NT passages where Paul uses the OT in a manner that does run counter to the original intent, but this Matthew passage is not an example.
Yet if we argue that the Haustafel in Ephesians actually leads to a gender blurring, homosexual affirming reading, then we are, on its face, running counter not only to the text, but the historical role and position of the Haustafel itself.