Hydra damage supposed buff not in patchnotes?

The written buff from 14 to 16 damage doesn’t correspond with the sneakpeak buff serveral streamers were told about being 16 to 18 damage.

Is this a missed correction or were they given wrong information?

Since all the core and mastery skills are getting an additional 15-20% buff it would be nice if conjuration got the same treatment (since its not stated that the buff also affects these skills).