No, you can still travel there. Presumably you also would've done mandatory quarantine to enter Thailand. However, your application is unlikely to be refused anyway provided you provide them with whatever documentation they require.
not everyone is a national of those bordering countries so as far as the Thai govt would be concerned you can fly to the country of your passport. There have been reports of some immigration offices asking for proof you can't go back home in order to provide the unable to travel due to covid extensions.