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Sure looks like no. Nothing on the CDC site:
https://www.cdc.gov/vhf/ebola/history/chronology.html

https://www.cdc.gov/vhf/ebola/outbreaks/index-2018.html

And several reports showing it's not:
https://www.reuters.com/fact-check/no-evidence-burning-man-officials-announced-ebola-case-x-2023-09-13/
https://www.reuters.com/article/idUSL1N3AJ0HJ/

https://apnews.com/article/fact-check-burning-man-festival-ebola-national-emergency-498334622942

Creator is inactive and unresponsive. Resolves No.

@EvanConrad3b7e Was it?

https://www.forbes.com/sites/mattnovak/2023/09/02/no-theres-not-an-ebola-outbreak-at-burning-man/?sh=fc46a815dd72

No, There’s Not An Ebola Outbreak At Burning Man

Some social media users claim an Ebola outbreak has started at Burning Man. But it’s simply not true.

The alleged CDC tweet is obviously photoshopped, come on.

dropping 3 mana in this market on the off-chance it's confirmed true

Various people claiming the CDC posted and deleted a tweet about an ebola outbreak: https://twitter.com/TheFemoid/status/1698111169699913839