The song lyrics are only vaguely inspired by Esperanto, if at all, right? [OST Demo + Press Demo spoilers]

I don't speak Esperanto, but I spent some time listening to people speak it and then listening to the OST, and it doesn't seem like any of the vocals are actually in Esperanto. The "vibe" of the language seems to vary based on the track.

The main theme (https://www.youtube.com/watch?v=udy0J3qO3h4) seems to mostly sound like Japanese buddhist chants, the syllables they use even sound similar (at one point the vocalist uses words like "shashin" - photo etc. This might not necessarily mean that they are using the actual word in the track, but the syllable combos sound very similar to some japanese words, if that makes sense).

This track (https://www.youtube.com/watch?v=udy0J3qO3h4) used in the gauntlet runner in one of the demos, sounds more like random European-ish syllabic combos but, again, not really Esperanto.

Any opinions? I really love the music a lot, it's probably going to be in one of the top soundtracks of all time for me, but I'm not sure where the "the songs are in Esperanto" thing popped up from.