It's not really that unlikely. In the exact same brief upholding the Texas Porn ID law they're arguing that states have the power to decide what is obscene or not; they're setting up the blocks for saying things like any LGBT content is inherently obscene. This is especially clear in another ruling posted today [1] where the supreme court argues that parents have a right to fully withhold children from any LGBT content they might experience from school.

[1] https://www.supremecourt.gov/opinions/24pdf/24-297_4f14.pdf