Maltiez was brought onto the team primarily as a Mod API programmer. A very large portion of his work has been bug fixes and changes to the API, either extending what mods are able to do or making certain things easier to accomplish without having to work around the existing API.
Because most of that work is in the API, the actual source involved is also publicly available through Anego Studios' GitHub. This isn't code that only exists inside some private build where nobody outside the dev team can see what is actually being shipped.
He also isn't overseeing or directing some large part of the combat update. Given his experience with his previous combat overhaul mod, it shouldn't be surprising that he has helped with parts of it or offered input where relevant, but much of his earlier work was focused more around bug fixing and changes or additions involving entities, animal AI, and the modding API in general.
I don't really want to get into internal development specifics beyond what is already publicly visible, but I do think there is a fairly distorted picture forming of what his role on the team actually was