Scientifically yes.
Spiritually darkness has a certain reality, being more than the absence of light.
Metaphorically darkness symbolizes distress, mourning, perplexity, ignorance, captivity and the condition of the spiritually unenlightened.
I understand where your coming from, but taking Jung literally would practically nullify all of his work (taking it out of context of its time), its more a descriptor in the metaphorical sense.
Describing things like emotional states / philosophical situations in simple words is frought with interpretive problems.
🙏