My experience with goblins in Nahantu there was no change. Horrible spawn rates. Someone up there needs to look up the definition of horde.
Now I did see an occasional goblin in helltides outside Nahantu but nothing that would lead me to believe there was an event happening. I also saw my first goblin spawn in a NMD without using the one goblin scroll. Seems one goblin is a horde. Maybe they are counting in binary.