Trauma impacts the wiring of the brain and many times distorts thinking and judgment.
Yes, delusion is a trauma-impacted thinking pattern.
This then can lead to "trauma bonding" where a person defends their abuser due to previous trauma.
You've missed the mark with some of your healing suggestions. "Stop romanticizing" is easier said than done for people impacted by trauma.
Safety, trust, attachment and other issues are stored in the lower parts of the trauma impacted brain and they need to be dealt with first before any cognitive suggestions for change.