Kolya·작년·discussThe article you linked to specifically says there are only voiceless plosives in Mandarin!
Kolya·작년·discussThe examples are cherry-picked. I took a photo outside my office window in a built-up area, o3 thought for 5m 7s (!), and it got the location wrong by 40km. Doesn't look solved to me.
Kolya·작년·discussThere are ways you could establish eligibility without a birth date. For example, they may have a WW2 service record but no record of their birth.