There's this extension. I'm the new maintainer of it and I want to update the extension's name, description, logo and publisher meta data (located in package.json).
If I do that, will I lose the marketplace's downloads and stars statistics? I'm afraid I might lose it, because the unique identifier (publisher.extension_name) would change.

I did some experiementing:
Update extension name (through display name): fine
Updating other minor extension details: fine
Updating name: fails 
Updating publisher: fails

So in answer to your question, no, you can't update your publisher while still preserving download count. You have three options:
A. Stay with same publisher, change display name.
B. Start new extension from scratch. Add code in the original extension that displays a info message redirecting to the new one and you should get most of your downloads back.
C. contact marketplace support and ask them for a new copy feature (good luck)
I should note that you can add users to your publisher, so if you want to publish under a different account that is possible, just not changing the publisher itself.

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