The amount of tax credits is also directly tied to employee count. If they are saving money in one area, while increasing employee count at the same or higher cost, that means they are either hiring low tier employees, or they are reducing (which they are not, AFAICT in this filing) costs in other areas which makes up for the increased cost of the increased employee count.
Either way, they are operating on a month-to-month basis as a studio being funded by a parent company. They have no outside income, and their structure is no different from any publisher-owned external studio. If the parent stops sending money, or runs into financial trouble, the studio is dead.