not technically but to get the 12 month extension based on retirement you need 800 K THB in a Thai bank for 2 months prior to applying for the extension and 3 months after with the balance not dropping below 400K
I am sure this is explained more fully on the official visa website
Every medical DTV I have read about required meeting the medical practitioner in person and getting a treatment plan
Some people managed approval based on 1 appointment but that is unlikely now but even those were initially in Thailand to get all the paperwork etc and then applied from outside Thailand