To my knowledge you are correct
Every god after ascending let go of their demigod memories because to be a god is to be a perfect neutral impassive divine being and not be shaken by these. Gods arent even suppose to play family and imitate humans n human relationship dynamics because a god borne out of another is a complete individual without any concept of blood ties or stuff. But seth n his siblings were the anomaly who lived together like siblings and loved each other. After ascending one cannot chase their past lifr memory or else they'll break taboo and face backlash in the form of soul fracturing n perish
Okay So then how does Osiris remember all this(￣∇￣")
Its not clear yet whether he really got his memories back or not. What hes rambling rn is full of contradictions and counterargumentive which i believe could be side effects of backlash. Also since he died n went to duat theres also a chance that he mightve been able to access some if not full of his past live memories without breaking said taboo which is exclusive only for full fledged gods. Also he being seth's lover isnt confirmed. Its just a vague speculation based on his claims which are fickle n untrustworthy. Based on the clues and cryptic hints that we have from mojito the possibility of seth and HTE being lovers or close relationship is higher than osiris n seth being lovers. What could be likely is osiris grew fond of seth and one sidedly fell in love wirh him n decided to pursue him after they became gods
So is it true that they had a past and Seth really lost his memory I'm a bit confused Abt this(〜￣△￣)〜