It is the same conference! They have rebranded this year to Neovim conf [0]. The conference however is not exclusive to Neovim content.

[0]: https://www.neovimconf.live/rebranding-rationale

That's confusing to say, at best.

If it's called VimConf, I could understand including content from anything vim related, even vi or neovim stuff (or from the other forks/variations/bases).

But if it's called NeovimConf, I wouldn't expect that to include the entire Vi ecosystem.

According to the FAQs they rebranded because all the traditional vim people complained about too much neovim content.

Apparently the neovim people are more chill about it.

The neovim people are even chill about Emacs evil-mode content.

Most VIM stuff works in NeoVIM as well. NeoVIM exclusive stuff doesn’t work as well or at all in VIM.

That will be changing soon. Vim 9 has a new version of Vimscript (called Vim9script) which Neovim doesn't support, and its APIs for things like async jobs are also different. However Vimscript itself will probably remain a common denominator for many years to come.

TJ DeVries (one of the Neovim contributors, and a frequent streamer) was working on some sort of vim9 translation support for Neovim. Seems more like a side project rather than something that will be built into Neovim, though.

https://github.com/tjdevries/vim9jit

What's the connection between ThePrimeagen and Neovim?

IDK, you'd have to ask him yourself.

What I was referring to was this plugin he made and gave a talk on in a past vim conference:

https://www.youtube.com/watch?v=Qnos8aApa9g

Harpoon is really cool, especially if you only work with 3 to 4 files. The ability to switch files with two keys is extremely nice. It's just a very ergonomic and pleasant plugin to use.

Looks like ThePrimeagen is one of the conference hosts/announcers