It's in the article — she seems to have had a substantial role at Tesla and Neuralink's AI teams:
Zilis is a rising star in Musk's empire. Born in Markham, Ontario, Zilis received her bachelor's degree in economics and philosophy in 2008 from Yale, where she also played goalie on the women's ice-hockey team. A lifelong athlete, she has been pictured on social media surfing, zip-lining, and ice climbing. After beginning her career at IBM, she joined the early-stage venture-capital fund Bloomberg Beta, where she led investment efforts in data and machine learning. She was on Forbes' 30 Under 30 list in the venture-capital category in 2015.
Zilis met Musk through her work with OpenAI, the artificial-intelligence research-and-deployment nonprofit Musk cofounded in 2015. She serves as the youngest member of OpenAI's board of directors. In 2017, Zilis moved to Tesla, where she was a project director, deploying her AI expertise on the Autopilot and chip-design teams. Today she holds the title of director of operations and special projects for Neuralink, where Musk is a co-CEO. She previously worked as a project director in the CEO's office. She's recently been floated as one of the people Musk could tap to run Twitter after his acquisition.
During Zilis' tenure at Neuralink, the company has conducted surgical trials of its Bluetooth-enabled brain chips on monkeys and pigs and enabled a nine-year-old macaque to play the video game Pong using its brain. Musk has suggested human trials could start by the end of 2022.