Maybe I read this differently, or perhaps Ambrosia is simply making a joke and I'm failing to pick up on that

But doesn't this list simply reflect that the listed creature can communicate in a way that is fitting for that type?
Essentially splitting the forms between Creature and Humanoid types, where creatures can use a language such as Animal to communicate and the Humanoid types can use more complex dialects like common and use words. Sorry to ask for such detailed clarification but are each of the humanoid type races able to speak any language which the character already knows? Can a Minotaur speak Elven, a Drider Celestial? In my experience the humanoid races can be further broken down between monstrous types and sophisticated types. Where the Monstrous types are limited in the use of their tongue and Sophisticated have the ability to speak in whatever manner they are knowledgeable.
My main question is, is this list to be taken literally in that any form on it is able to speak in any language which is already available to the character? Or is it simply a reflection that the listed forms can communicate in SOME way, but not all which are available to that character.
Also a question specific for one of my characters, which is obviously Vincent. For the "Dragons (Wyrmlings to Ancient)" It was told to me by a DM that the larger Elder and Ancient dragons can speak words and communicate in Common, but that smaller Wyrmlings and drakes and such were limited to only chittering and animal speak. Can the difference and limitations in communication for each please be clearly defined?
Hopefully I'm not totally missing the point here, I'm just a little confused and would appreciate any clarification that the team might provide.