I'm sorry to hear that you don't understand metaphorical depictions of psychological complexes.
Of course I understood it. There was nothing more to understand after the first 30 sec. of the insipid monster scenes and repetitious talk of doorways. Of course depth adds to viewer engagement but this series, like Discovery, is a low quality attempt that adds nothing. Remember the high level of violence in discovery previous seasons? It was gratuitous and a vain, cheap attempt at engagement - exactly like this. This has the added feature of being incredibly boring and tedious.
Why am I even typing this. Groups of trekkies discussing star trek episodes online is a useless waste of one's time. I'm just venting about what trash this episode was; in a delusional hope that some producer somewhere is reading this and deciding to stop going ahead with garbage episodes that are obviously so even on paper before a decision is made.