Oh yes, that's true, this isn't initially published by Ubisoft themselves which also happens rarely these days for Ubi games. It maybe depends on what the parties agreed & stuff, could be a chance there. But to be honest, having in mind this was planned to be released also on CD, I see the space wasn't an issue because you have like 30 minutes unused and that would be probably enough to have the missing tracks. Yeah, I don't know what's the deal with that.
You can maybe ask the artist about the missing tracks:
https://twitter.com/beatricepirate
https://www.facebook.com/coeurdepirate.officiel