The term itself, at least in this decade, or the previous 2 is a misnomer.
It's more of a retro - homage to the goth culture of the 80s. The look is similar, as is the overall doom and gloom prevailing nature, but the music that drives it or that which capitalizes on it is very very different.
Modern goth music is more angst and anger funneled through a sort of nu metal inspired creative pallet than the slower paced, dark satire embedded amongst an atmospheric soundscape that was part and parcel of my generation.
In terms of message, nu goth is more angry teen diet punk lyrics attached to power chords on seven string guitars, where 80s goth was all about righteous indignation and irony attached to modulation effects and single coil Fenders through Roland JCS and Fender Twins.