That was me who said that.
It is indeed 2-cours, but after Otorimonogatari ends, were switching/rewinding back to Onimonogatari, which occurs directly after Kabuki AND concurrently with Tsubasa-Tiger's later half.
Koyomi's Big-dAmn-hero moment at the end of Tsubasa Tiger occurs as he returns after the conclusion of Onimonogatari's events.
Otorimonogatari's final scenes/event leads directly into Koimonogatari, which is THE last arc were getting this season, which at earliest will start airing last week of November. So the complete conclusion to Otorimonogatari's conflict with Nadeko Medusa the Goddess occurs in Koi. Nadeko's fate is resolved in Koi, as is Koyomi/Shinobu and Hitagi's.
Hitagi finally has another role/appearance in Otori. We haven't seen her since Tsubasa Tiger iirc.