In November 2022, Gearbox Entertainment acquired the Risk of Rain IP. Hopoo Games remains an independent studio. Hopoo now states that they are working on other games and projects.
The Steam page for the DLC also lists Gearbox Software as the developer and Gearbox Publishing as the publisher so yeah. Seems accurate.
From Wikipedia:
The Steam page for the DLC also lists Gearbox Software as the developer and Gearbox Publishing as the publisher so yeah. Seems accurate.