Illustrator changing CMYK color space to RGB

Looking for advice in resolving a color space issue -- other threads have only lead to dead ends. Would love some help!

Problem: When I export a .png from a CMYK Illustrator doc, it uses the RGB color space.

Context: (relevant photos included!)

1. My mac OS is updated (Catalina 10.15.6) and my CC Illustrator software is up to date (v 24.2.1).
2. When creating my document, I've chosen Color Mode as CMYK, and I can double check that is in the doc (both File > Document Color Mode and the file header bar show CMYK).
3. All of the colors I use in the doc are CMYK.
4. I use Export As > .png to save my artboard. 

Outcome: When I right click on my file in Finder with the "get info" option, it shows the color space to be RGB. (And if I open it in Photoshop 2020, it shows it to be RGB as well). 

Question: Why is this happening and what can I do to fix it so that it exports in CMYK? Does it have to do with the png options after exporting?

Thank you!

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