I think it's applicable across the board. I've done persona work both for an established product/community as well as new communities and used more or less the same method for developing those personas.
You can do a first pass to target your ideal members (and develop outreach tactics based on that persona profile), and then you can do additional/updated ones once you've established your community to get a better understanding of who your members are and which ones embody what you would like to see more of in your community.
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I think it's applicable across the board. I've done persona work both for an established product/community as well as new communities and used more or less the same method for developing those personas.
You can do a first pass to target your ideal members (and develop outreach tactics based on that persona profile), and then you can do additional/updated ones once you've established your community to get a better understanding of who your members are and which ones embody what you would like to see more of in your community.