I agree with you in both points. It looks like a single (one track plus remix), but they intended for it to be an EP, so the artist (label) intent should have priority and it should be an EP.
Their singles (catalog numbers MCS, MCF) usually have only one track. 792 out of 807 MCS singles and 33 out of 35 MCF singles only have one track.
Monstercat’s catalog over at https://www.monstercat.com/music (which also has an API) is one of the best things that this label has in regards to the data of their music.
This is how their API looks like for the release in question, also listing it’s type as an EP: https://connect.monstercat.com/api/catalog/release/MCEP088.