I have aphantasia and can't memorize sounds or recall them. For decades I thought I'm deaf (Ockham say hi). But I picked up piano, play for 3 years, can't discern C from G if my life depended on it but my friends tell me I'm pretty decent composer.
Writing this so people don't get disappointed about themselves just because they can't pick ear skills.
I have (visual) aphantasia. But am better able to remember / hear notes and timbres in my head than images. Never really tried composing and for the number of years I took piano lessons I’m pretty crap at it (lessons don’t matter if you don’t practice in between).
But sounds stick with me more than visuals. So interesting that it’s all on a spectrum with these various facets.
That's also the reason why I can compose at all. The analogy would be like: I don't know how pink color is named, but I can say it's pretty.
And on the output: I don't know what colors I used, but the image is pretty.
Only my music teacher tried to play and I knew it didn't work well. It's a peculiar thing.