In a blog post called Continuing to grow and invest across America in 2020, Sundar Pichai has said that Google will invest $10 billion. This new investment will concentrate in 11 States which are Colorado, Georgia, Massachusetts, Nebraska, New York, Oklahoma, Ohio, Pennsylvania, Texas, Washington, and California. Stadia is not specifically mentioned in the blog post.
Stadia works in datacentres so this expansion including a new datacentre in Ohio should be good news for Stadia going forward. They are also expanding existing datacentres in existing locations so this should relieve the fears that Google is pulling out of the cloud arena,