I am the DM for a player character that is a Kenku Swashbuckler that is currently level 8 and will be level 9 within the next few sessions. The player has been following the advice in the sidebar of Volo's where he simply describes the sound and intention used to communicate, but has picked up enough phrases to communicate in Common when needed (but it sounds more like a speak and spell or Bumblebee from Transformers). My concern is with the Swashbuckler level 9 feature Panache (emphasis mine):
At 9th level, your charm becomes extraordinarily beguiling. As an action, you can make a Charisma (Persuasion) check contested by a creature's Wisdom (Insight) check. The creature must be able to hear you, and the two of you must share a language.
Relevant Kenku information from Volo's:
Mimicry - You can mimic sounds you have heard, including voices. A creature that hears the sounds can tell they are imitations with a successful Wisdom (Insight) check opposed by your Charisma (Deception) check.
Languages - You can read and write Common and Auran, but you can only speak using your Mimicry trait.
So, if the Kenku is using the Mimicry trait to repeat a phrase in Common, a language both the Kenku and the target understand, would this meet the shared language requirement of the Panache feature?