Many factual errors there.
In humans, the layers behind the photosensitive layer of the retina absorb light. Most proximal is the retinal pigmented epithelium (RPE), behind that is the choroid. The pigments there absorb light to reduce scatter, which increases acuity. Several vertebrate species have a tapetum lucidum, a reflective layer that is derived from either the RPE or the choroid (depending on species). The tapetum lucidum reflects light back to the photoreceptors, which increases low-light sensitivity at the cost of some loss of acuity due to scatter. The tapetum lucidum is responsible for the eyeshine you see in animals at night.
Humans do not have a tapetum lucidum. Red-eye results from reflection of on-axis light from the fundus of the eye, and is red because of the blood.
In animals, you can see both eyeshine and red-eye – they are separate effects with different causes.
So sorry, but no – the human eye does not 'sort of' contain a mirror, and when you look through an EVF you're not 'looking through a mirror'. Unless you're this cute little guy.
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