I share your confusion. I was clear that the Tune annual policy for 15000 was covid 19 cover only, but it was advertised as "Satisfies Immigration Requirement" and that is my query. However, from its wording, your second policy ("This health insurance also covers covid-19 etc") implies broad cover even though it contains the same policy number as the 15000 baht covid policy-
I`ve just winged another email to them asking for clarification and if neccesary I will change the cover, but so far they are not responding.