The default text color in Swatches Info is rich RGB black when used in a CMYK document
Create a CMYK document with Print profile.
Create a Swatches Info object.
Notice the black text in it is way too sharp on edges.
Select text and check its color. It’s RGB 0 0 0, displayed in CMYK something like 91,17 78,69 61,95 97,45 (depending on the profile used, of course).
It makes zero sense to use RGB Black in a CMYK document... in a live object especially.
Yes, black color is not defined with Normal Paragraph Style, but is properly defined when a text is created with Type Tool. Why doesn’t this function know about it?

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monokano commented
Currently, even when set to K100, it is ultimately converted to RGB, and in a CMYK document, it is converted to a CMYK four-color mix. In a CMYK document, the text color should also be set to CMYK mode, with K100 as the default.