I’m confused too. But that doesn’t stop the word yom from generating thousands of posts on this forum. It comes up at least every couple months, and plenty of ECs are not getting with the “of course yom means a regular day” program. Lots of them borrow heavily from OEC arguments.
Any time anyone talks about “literal” meaning, it is colloquial and not technical. In the two MA programs in linguistics I did, “literal meaning” never came up as a thing we studied. There’s “primary sense” and “secondary sense” (which applies to this case, because there’s no good reason to posit a secondary sense of the word ‘day’) but the meaning of a text is never as simple as summing up the senses of individual words. Meaning is calculated with reference to a shared context and we all go through fairly complicated mental processing to determine what a speaker intended for us to infer from what they said. That’s why computers have such a hard time with natural human language.
The fact that ‘day’ is used in its primary sense (normal day), does not tell you diddly squat about whether the entire passage is meant to be understood symbolically, metaphorically, allegorically, historically, factually, or otherwise.
For example, in these lines from the poem “Mother to Son” by Langston Hughes, almost all the words are used in their primary senses, but the reader can easily calculate that they are contributing to the extended image of “life is like a stairway” and the real subject is life, not a physical stairway that existed somewhere in history.
Well, Son, I tell you
life for me ain’t been no crystal stair.
It’s had tacks in it,
And boards torn up, and places with no carpet on the floor–
It would be silly to tell your lit teacher that in this poem, Hughes intended a special meaning of “tack” that means painful experience not sharp metal object. Or that in this poem carpet doesn’t “literally” mean carpet. Yes, it does. Carpet is part of the image. Normal carpet, not some special “metaphorical use only” carpet. The fact that places in stairs are worn out, dangerous, and lacking luxury allows you to calculate what Hughes is intending to say about the hardships of life, but you don’t need a special meaning for the word ‘carpet’ to get to that meaning.