I have a little experience in voice over work in games and I've done some research of the industry and continue to explore information. I can tell you that usually the voice work is one of the last things done before the completion of a game project. So if these clips are recent, it could very well mean that it was done for an upcoming release, something that may be out within the next few months or so.
I'm sure it has absolutely nothing to do with whatever new project they are just now hiring for, whether it's Sims 5 or not. They would certainly not start with the voice work and let it sit through the entirety of the game's creation because a whole lot can change by the time it prepares for release.
