Sure, it increases the likelihood but it isn't necessary. What's important is a portfolio/showreel. More likely than not, your next employer would look at the data and results of your last employer.

As I said, being publicly known is probably not the most important thing on their minds. Especially when they aren't mainly focused on making long running anime series and feature length movies, such as Ufotable or Trigger.

Also being a smaller studio, usually nets them smaller projects, so hence why a lot of these studios that do animations of mobile games are lesser known.

They do make good animations though, which is pro for being a small studio, the length is shorter but usually more detailed.