I was always wondering this too.
not that I don’t believe you, but were you told this from campfire or is this speculation? 2019 makes sense to me also.
I don't remember exactly when the Solstice was first announced, but I'm pretty sure it was before they released the many different iterations & special editions, which would suggest Andromeda v2 or v3 at the latest. My understanding is the v2 & v3 only had minor updates to the shell & connectors, but the tuning remained the same & Ken hasn't mentioned any changes to the Solstice since it was first released.
~edit - Solstice was announced late-November 2019, so you'd have to go back and see which version of Andromeda coincides with that time frame; I don't remember when v2 & v3 were released.