You can , type in enter date and leave date being one month apart .
Maybe they do special monthly rates and they are typically between 10 nights and 15 nights (cost) for the stay of one month .
The hotel in question charges 1200 Baht per night , so their monthly charges would be about , between 12 000 /18 000 Baht per month .
No way would that resort be 2500 per month , more likely 25 000 per month , unless he got a discount on the condition that he publicised the place on his YouTube page ?