Spirit Whisperer Archetype

[GreySector]

The spirit whisperer archetype says:

Spirit Link wrote:

At 1st level, a spirit whisperer forms a mystical bond with a spirit. The spirit whisperer picks a spirit from the shaman's list of spirits. At 1st level, he gains the spirit ability granted by that spirit. At 8th level, he gains the greater spirit ability granted by that spirit. At 20th level, the spirit whisperer gains the manifestation ability granted by that spirit. He uses his wizard level as his shaman level for determining the effects and the DCs of abilities granted by the spirit. In addition, he uses his Intelligence modifier in place of his Wisdom modifier for these abilities.

None of the spirit abilities use Wisdom. They all use Charisma.

This seems like an oversight. Thoughts?

[Disk Elemental]

I believe it refers to the DC to save against the abilities.

The second sentence in the AoN page OP linked wrote:

Unless otherwise noted, the DC to save against the special abilities granted by a spirit is equal to 10 + 1/2 the shaman’s level + the shaman’s Wisdom modifier.