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Yes, First Class passengers connecting in business class, have access.
I was just there yesterday in AUH and had a 13 hour layover.
My boarding pass had both my First Class and Business Class flights on there.
The first time I entered the private First Class dining area (for dinner), there was no issue.
The following morning when I went back for breakfast and there was a new check-in lady (who wasn’t familiar with the policies), she wouldn’t let me in because I was in business.
I had to explain to her that the plane didn’t have 3 cabins and then she had to go speak with the manager, and it got resolved.