Definitely there is a sizeable market for gay couples visiting Thailand or single gay males (I wont bother talking about lesbians on this forum) that are not looking for prostitutes. I know a number of gay couples that go there and they only interested in each other. The issue is that in many countries it is still uncomfortable, risky or even outright dangerous to travel as a gay couple. Thailand can benefit from it. Promotional clips like this one only reassures potential visitors that they are safe and welcome. You also have to remember that most westerners never go outside of they traditional holiday spots (California - Florida for US and the Med for Europeans) because they don't know what to expect elsewhere. So the countries like Thailand still have to do a lot of marketing work to convince them.
This forum is mainly frequented by older types that are looking for sex for pay experiences (which are perfectly fine) so I'm not surprised they are looking at this clip from their perspective. After all, the days of Thailand making most of its tourists cash from sex are over - most of it is now made from couples and families, including gay ones.