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Not all of them, a couple don't.
But there is no such thing as HF21. There is no code, there is nothing to support.

All we have now is an unofficial proposal.

Who doesn't support the "HF21" (SPS + inflation + EIP)?

I know @drakos said he doesn’t support EIP. I am not sure who else.

I don't support EIP it in its current form. I'm for the downvote pool and the convergent curve, but don't like the idea of 50% curation because I think it will harm the authors, and as you mentioned Marky, let's not forget about the apps with beneficiaries, which will even slash the author rewards further. Given that EIP is a package (the "take it" or "leave it" sort), then it's a "leave it" for me. What I also dislike is their cramming it with HF21. We all know what happened when after they crammed too many things in HF20 and I'd hate to see history repeat itself. One thing at a time. Besides, the supermajority is in favor of EIP so it will surely pass.

I posted the other day on this topic and pulled quotes from @steemitblog's post that was pretty clear they were not intending to put EIP in the next HF but were bringing it forward for discussion in a future HF.

If that has changed.. I can't seem to find any post about it.

There were talks on slack to include SPS and EIP together to reduce the hassle of 2 hardforks. Nothing is definitive yet, anything is possible.

The next Witness Chat in the Ramble is coming up on June 12th. I'm anticipating the HF will be part of the discussions.

Yabamatt doesn't either I believe.