Artificers also make better skill monkeys, particularly when it comes to obscure skills for much the same reason. Though you might need 1 rank to get around trained only requirements.
It works better in the game I intended it for as there there are certain house rules regarding skills, namely the fusing of similar skills. Ergo Hide + Move Silently becomes Stealth, and anything that gave a bonus to one now does to both.
That gives us +20 Stealth on Superior Invisibility, 8 from the Umbral Collar granted Dark template, 15 from an enhancement item, 12 from skill enchantment, and 4-5 dex for a total of 59-60. Assuming you have that Ioun Stone add another 1, Luck stone is another 1 and Artificers can easily afford to dip into the obscure bonus types since they can easily max the common ones. You could probably drop the armor property and still never be detected except by three fairly rare and obscure counters, one of which still has to find you normally as it does not reveal creatures that are simply hidden. You could possibly even drop the skill enhancement, but then you run a significant risk against most outsiders who tends towards True Seeing, and sharp senses. With only a +15 at most (+1 circumstance from Persisted Focusing chant, because why not?) you aren't so stellar at it anymore.
Of course, as the original post illustrated it still works fine in RAW environments, ensuring that the information is useful to others.