Sure looks like it's a retrofit, just based on that part number: Spoiler Sunroofs
and then your neighbor definitely confirmed that. I presume your glass retracts above the roof, rather than into it?
It's so weird to see a retrofit anymore when they're so widely available.
Based on what I'm seeing, I expect they have a full rubber seal all the way around the glass (since it doesn't slide back, under the roof), and then plan on that keeping the sunroof watertight, thus requiring no drain tubes.
It might just be the picture, but it does look like that seal is showing some chafing, meaning the seal isn't perfect anymore, which would allow water in.