I've never heard of them, so I looked them up.
It seems that the founder, Becky Parker Geist, is also the founder of BAIPA (Bay Area Independent Publishers Association), who have an "About BAIPA" video on YouTube with 257 views since April 2017.
I was unable to find where ProAudio voices publish their audiobooks, but I did notice a review on the ProAudio voices website from "Heidi Joulios (author) Color My Coral". This book is available on Amazon (https://www.amazon.co.uk/Color-My-Coral ... 1936528029
), but the idea of making an audiobook out of a coloring book looks highly unlikely.
ProAudio voices also has a facebook page with 321 followers and 300 likes.
I was able to find only one audiobook by Becky Parker Geist:
Regardless of what Becky Parker Geist might claim, it is not possible to achieve professional audiobook quality from Zoom (or other voip).
Here we can hear a short sample from the ProAudio voices podcast. I think that it is immediately obvious that the sound quality is not good enough for a professional audiobook.
I may be wrong, but it seems to me that Becky Parker Geist is a VO artist with several grand and fairly professional looking websites.