I wouldn't worry about as it doesn't actually change anything. You would still have to get a new passport well before December 2029. Likely 6 months before.
Correct, Thailand, unlike the Philippines, collects biometrics, meaning your face and fingerprints will hit to the same individual, regardless of what passport he or she carries. That's what people mean when they say "everything is in the computer". What do you think they take your fingerprints for at the airport? For fun?