Here is an enlarged crop of a 5 min ISO1600 dark frame I took last night indoors, lens off, body cap in place.
Maybe I'm not doing it tight but it appears less noisy than yours.
I can zoom in to pixel level and it shows artifacts (noise) but as I said...a lot less than you are showing.
edit:
I didn't resize the image (just made it a small enough jpg to fit the forum
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