My sibling in autism, in the English phrasiology “You’re as _ as the day I _ you”, the adjective is to be understood as applying to the subject both times (i.e. “You’re as _ as (you were on) the day I _ you”).
“The day I lost you” is an adjective (edit: wait, adverb?) phrase here, not a noun phrase. But either would be grammatically correct, so you can (at most) say it’s ambiguous.
I’d be insulted if someone compared me to the worst day of their life.
He’s not comparing her to the day. He’s saying she was beautiful back then and she’s just as beautiful 15+ years later.
That might be what he meant, but it’s not what the captions say.
My sibling in autism, in the English phrasiology “You’re as _ as the day I _ you”, the adjective is to be understood as applying to the subject both times (i.e. “You’re as _ as (you were on) the day I _ you”).
One should decide what it meant.
“The day I lost you” is an adjective (edit: wait, adverb?) phrase here, not a noun phrase. But either would be grammatically correct, so you can (at most) say it’s ambiguous.