Looks like Briareos Frame wasn't actually enabled despite being included in the changelog, as it's not a selectable option for Core Bonuses. Just a heads up!

Incredible update! Titanomachy secured, now waiting on Tortuga for Siege Ram and then we can really get cookin <3

Sure enough! Looks like I forgot to add it to IPSN’s catalog, it’ll be in for the next patch. Thanks for the note :)