I had to do some digging but Jenna Powell is referred to as the production director or manager or something like that. So I dont think she is doing it alone and the tone of the redg fb post seems to back it up.
One of the things that we're hard at work doing is restoration on the Golden Age comics. We don't simply take the poor quality originals we have access to, we painstakingly restore the covers and augment the interior pages to make them readable in our high resolution app. This and all content is being handled and curated by Red Giant and while it is painstaking, it's a lot of fun to be part of preserving the history of our favorite medium. Here are some fun before and after examples of the hard work done by artists like Jenna Powell to present the very best Golden Age collection around!
Note it says "artists LIKE" and "We" a lot. Probably have several people. She probably manages the team. I dont see how the work being done could have been done by her alone unless she's some kind of superhuman. If so then damn benny married a real wonder woman!