From my understanding Thai embassies (in some counties) followed local laws. So if gay marriage was law of the land in that country, they would accept paperwork. Immigration would then follow the law of the land in Thailand.
Some Thai embassies have been allowing non O visas for gay couples for a long time. Issues have been with extensions in Thailand. This was before the recent change in laws
Also, fyi, the 90 days resets everytime you exit and re-enter. So if you exited and re-entered in November, your 90 day reporting would be for 90 days after that arrival.
Anonymous participant - so this a post from someone anonymous. Even then, it says 1 month and this applicant said it was a week or two. Common!!! Also, this post is from August.