Help Understanding Ghost Villain Action.

Hi! I'm currently trying to write a homebrew adventure using the latest Patreon packet. In the bestiary there is an undead level 1 leader titled, "Ghost." I'm having trouble wrapping my head around the 3rd and final Villain Action under the Ghost's stat block.

https://preview.redd.it/3dk5mdsrji0e1.png?width=424&format=png&auto=webp&s=e26dbb9ff1cb6d448a6db2e42713d23f3f96a929

The tier 2 and tier 3 result are both exactly the same. Also, the effect seems really strong. Lastly, 'Corruptive Phasing' is a passive trait that most incorporeal undead have, but this Villain Action makes it seem like 'Corruptive Phasing' is only available to the Ghost after using the Villain Action.

I understand that a leader is meant to be the final fight of an adventure, but this feels way stronger than other Level 1 Leaders in the packet unless I'm understanding it wrong, or there is some kind of typo.

Thanks for any help.