I've used Forever Black on a few cars over the years. As you say, it's a dye not a trim restorer so it's very long lasting. Not cheap at around £15 plus but a little goes a long way. The only issue I've had is you can get streaks if you don't apply it carefully and ideally you do need to mask off the paintwork if colouring trim still on the car.
I've only used the bottle with the sponge applicator. Looks like yours is an aerosol.
Love that plastic dye!