What happens when a vehicle dies with Hofri Ghostforge in play? (STX Spoilers)
The token will be an Artifact - Vehicle. It will not be a Spirit, even if it becomes a creature later.
This is primarily a consequence of rule 205.3d:

An object can’t gain a subtype that doesn’t correspond to one of that object’s types.

The subtype Spirit only corresponds to the types Creature and Tribal, and the permanent has neither of those types, so it cannot gain the Spirit type either.
The card Glasspool Mimic has a similar ability that copies a creature and adds creature subtypes:

You may have Glasspool Mimic enter the battlefield as a copy of a creature you control, except it’s a Shapeshifter Rogue in addition to its other types.

That card also has a couple of rulings that explain how that is handled with non-creature cards:

Glasspool Mimic copies exactly what was printed on the original creature (unless that creature is copying something else or is a token; see below), except that it’s also a Shapeshifter Rogue. It doesn’t copy whether that creature is tapped or untapped, whether it has any counters on it or any Auras and Equipment attached to it, or any non-copy effects that have changed its power, toughness, types, color, or so on. Most notably, if it copies a creature that’s not normally a creature, it won’t be a creature.


If Glasspool Mimic isn’t a creature, most likely because it copied a creature that was only temporarily a creature, it won’t be a Shapeshifter Rogue, even if it becomes a creature later.

Like on Glasspool Mimic, Hofri's ability says &quot;in addition to its other types&quot;, so it will still have the Artifact and Vehicle types.

If, instead of a Vehicle, the artifact in question was an animated Tribal Artifact such as Thornbite Staff, the token copy would have the Spirit type because the Sprit subtype corresponds to the Tribal type.