I had not called USCIS regarding this yet, So I called up their service center today and interestingly I was also told the same, that the said 240-day auto-extension applies to timely filled H4-EOS+H4-EAD as well. I tried to get some sort of assurance from him but he said he can't do that instead he transferred the call to his supervisor. I again explained my question to the supervisor, he then took good 2 mins to discuss it with someone else and told me that the instructions and guidelines they've actually does say that the said 240-day auto-extension applies to both the H4 i-539 & i-765. But he too wasn't able to give me any form of assurance, he instead suggested that I speak with my lawyer about it. Anyways, this certainly is a good news. I'll check my lawyer next and will update. Can you guys also update if you already spoke with your lawyers on this? thanks!