He was nerfed because he was overpowered. It only activates if and only if you hit a target successfully (another character). And yes, his invulnerability was reduced to 3 seconds instead of 4. But once again, hitting a target will only activate either his speed or his invulnerability, not always both (that's random now), so it won't be fixed. This had to be done in order to balance the characters
#Diego's a sitting duck
blazing storm
buoyant goblet
basically deleting a character
opal dawn
They simply need to fix Diego’s description to match his actual abilities to avoid confusion but definitely don’t make him back to being overpowered.
This is the first time I’m able to see a variety of different characters winning (due to balance) instead of mostly Diegos.