If there are, I expect them to be modified soon. The GDC has said that when a Q&A becomes invalid, the original Q&A is modified to clarify the correct answer. [Edit: see my later reply for the GDC’s quote.]
Q&As before the most recent manual update are definitely still valid.
I apologize for trying to answer this question when I knew it was in the wrong channel. [Edit: On second thought, including an answer in a reply might be appropriate after all, but I should have made it clear why I was doing it.]
I happened to remember that the GDC recently said something that would answer the question, and I didn’t want them to have to answer it again. I hoped that if I answered the question before it was put in the official Q&A, the GDC wouldn’t need to answer it themselves.
I agree that the old answer is hard to reference (the title is unrelated to Q&A questions), and I haven’t found any easily-referenced places that say what happens to outdated Q&A questions.