youre a bit behind on the info drops. just as that site is you linked.

on the discord it was already found out what this actually is. its not a vehicle to drive around. its a moveable siege weapon. a battering ram of some sort. there is a 3 render of it beeing assembled without the engine on the discord.

stupid high chance this is used in the new "fortress time" they devs talked about for ashlands. but its still a long ways off till then.