Does the new Teemo errata mean he triggers twice - once from Hidden and once from defending?

Ruling: Teemo does not trigger twice. The errata was only to clarify the existing text, specifically that Teemo needs an enemy unit to target for his trigger. The functionality remains the same.

Nuances:

• The image shown was the old text, not the new errata
• Teemo can only deal damage to one unit total, even if multiple Hidden cards are revealed