Embassy in Penang post this today. Don't know what the "medical certificate" is supposed to say on it as offical government announcements are as usual, lacking of any useful information and incomplete in thought, but if I were to guess I'd say it has something to do with the virus.
TLDR : Answer Summary
Recent announcements from the Embassy in Penang highlight new requirements for travelers entering Thailand from high-risk countries, mandating a valid health certificate. However, there is confusion regarding what constitutes a valid medical certificate, with discussions suggesting it may relate to COVID-19 status. Comments also reflect frustrations over the lack of clarity in official communications.