@Wolfgang ******
Let's make it easy:
The following are common "Non-Immigrant" (or Non-Imm) visas and do not qualify for the new 60 day extension of stay based on unable to travel due to COVID-19:
Non-B (based on employment, or being a director, or being a teacher)
Non ED (for studying)
Non-O (Based on being over 50, being married to a Thai national, being a trailing spouse, raising half-Thai child, working for a volunteer organization)
Non-OA (One year multiple entry visa based on being over 50)
The following are the "approved" tourist visas for the 60 day extension of stay based on unable to travel due to COVID-19:
30 day visa exempt ("ผ stamp")
Single entry tourist visa ("TR")
The following are the "unapproved" tourist visas/entries for the 60 day extension of stay based on unable to travel due to COVID-19. If a person is holding these visas/entries, I do not expect an immigration office to issue the 60 day extension of stay based on unable to travel due to COVID-19:
Entry on a bilateral agreement ("ผผ stamp")
15 day visa on arrival
Special Tourist Visa
See the attached list for which countries have visa on arrival, visa exempt, and bilateral agreements.