Did you ever read the tzitz eliezer ‘s teshuvah? He does not say that an adult can change their sex and marry the same gender. He is talking about freak incidents where a person loses or gains an organ min hashomayim, or babies who have genetic issues. What they’re saying never dawned on the tzitz eliezer or any other person before 10 years ago, when this abomination became popular.
The sefer dor tahapuchos was written about this issue, and he discusses the TE – the sefer used to be a secret among rabbonim who had to deal with otd and BT trans people, but now it’s readily available in seforim stores.
If you’ve bought into the idea that their marriage is acceptable according to anyone, you’ve become the exact people who are on what you describe as open orthodoxy. Go ask rabbi bender if a transgender person can marry a man – if you have the nerve to ask a rosh Yeshiva such a question. I guarantee he will be flabbergasted at the thought of it and will not look at you the same afterwards. It’s disgusting, and that couple is oseh aveiros beyad ramah.
What’s worse is that they are claiming to be frum, and as you’ve demonstrated, they’re able to infect those who are susceptible with their poison.
It’s not limited to open orthodoxy. Already in 2007, when i was in high school and was captain of the debate team, my school pulled out of the entirely MO school league because the finals were a debate about polyamory, stipulating that no religious arguments can be made. They already took toeva marriage as a given.
This league included the best and brightest of the mainstream MO schools in NYC. All of them. Shown to be rotten to the core.
This was 15 years ago. It’s only gotten worse.
MO is fake judaism. I’ve been there, i escaped its horrors. Don’t let anyone, even talmidei chachamim, have you believe what can be demonstrably false.