These are next up on the chopping block and the same logic used to overturn Roe v Wade can be used to overturn those. Thomas is merely voicing that reality instead of playing coy like other reactionary justices.
There are, IIRC, forced sterilization laws that depended on RvW, so perhaps those are back in fashion too.
This being a solo opinion is encouraging that they won't overturn every due process case.
Take heart! The majority ruling explicitly says that its reasoning does not apply to those, and goes into detail about why those rulings are different.
The majority also said in congressional testimony that Roe was settled, and then changed their minds when they had the power to overturn it.
Yeah, better hurry up while the conservatives still have the overwhelming majority on the court. You never know what the future brings...