Manning makes sense - all the details fit, and there aren't that many. Publishing is a stupid business that makes less and less sense every passing day. Self publishing and going through an outlet, marketing for yourself, or contracting out the relevant tasks, will save you a ton of money for anything publishers can offer anymore. They survive more and more often on grift and network effects that are increasingly irrelevant and often run counter to the interests of a given author or work.

Glad the author got out relatively unscathed.

Self publish - especially with AI available to get you through the stuff where you just need superficial or process knowledge, like which firms to hire and how to market a self-published work, what boilerplate legal protections you need. You'll get 99% of the value of a big publishing firm at a small fraction of the cost, and you won't have to put up with someone else taking a cut just because they know a few things that they don't want to tell you in order to justify taking your money.