The AC can always decide not to have a 2.5 but straight a 3.0 in like 8 months or so. I think it is more effort for the few maintainers and core developers that we have to have two branches sitting around in different repos.
But apart from that: Migrating the actions can also happen for OH 2.5, there are no breaking changes involved, I think. Removing OH1 stuff from the website is just to reduce confusion for newcomers. The stuff will still be there to be used.