I'd like to believe that.
In any case, and as a general comment, I desperately wanted to use my U.S. address, simply because that's the one I use for IRS stuff already, and because I will likely be changing residences in the future and then have to go through all of this all over again. The fear there is should you slip through a crack in the process it is tantamount to potentially losing your benefit.
That said, I also had reservations about dealing with Manila. But those turned out to be unfounded. My application process went about as smoothly as could be hoped for.
One final comment: they will send mail to your Thai address that contains your SSN. So if you have identity vulnerabilities, it's something to factor into your decision I think.