This is a thorny issue. Thailand does not yet recognize same sex legal unions of any kind. So you wouldn't qualify under the "official" married couples rule. But, Thailand is also a very practical place and the hotel itself might be willing to bend a few rules to make sure you stay with them. Best to ask your properties of interest.
Statistically that may be the case about surges, however it is equally noticeable and reported on that the majority of hospitalisation cases are of non-vaccinated people. Even some of the most conservative US media and Governors seem to be mentioning this now, which suggests an effect itself!
I have never believed this can be attacked with one all-solving method or by one country alone. Everyone is different enough for that not to happen. If Ivermectin is showing results, brilliant, then share the actual clinical data so others can learn how best to do it.
Such data has been repeatedly demanded of and delivered in quantities for vaccines. (except for Sinovac perhaps). Why the reluctance to do the same for other methods including treatments like Ivermectin?