Here, it is advertised that this CD has 10 tracks. All unreleased at that time, 2015.
https://pbs.twimg.com/media/CVSvj2tU...pg&name=medium
from this
tweet
then, we have this photo
https://pbs.twimg.com/media/COmhvx5V...pg&name=medium
from this
tweet
10 tracks confirmed. Release date most likely 2015 according to tweet date.
Clearly not specified how it was handed but looking at the date I would say most likely at TGS 2015 held a few days after this tweet.
Then of course, most important we have a nice look at the tracklist. Only 9 tracks shown out of 10 but if we gather all data we had so far, included the link you provided, tracklist is:
01 Tectorium (EUST ネソス島実験ドーム)
02 Highlander (EUST ベネヴィス高原地帯)
03 Varying Hare (EUST マリナセドナ大雪山)
04 Escape from the presence (EUST ????)
05 息壌(そくじょう) (GRF ネソス島実験ドーム)
06 徒跣(かちはだし) (GRF ベネヴィス高原地帯)
07 颪(おろし) (GRF マリナセドナ大雪山)
08 矰繳(いぐるみ) (GRF ????)
09 ぼく牛マン
10 マジ牛マン