Q: Does this include private/commercial testing?
A: The majority of states include some measure of commercial testing in their official COVID-19 data. An "A" grade from The COVID Tracking Project signifies reliable numbers and the incorporation of all commercial tests. As of today, 0 of 56 states & territories are graded "A". While California is notably grade "B", the next five most populous states are grade "A". See the full list, with shortcomings for each, here.
Q: What is our ability to re-test, after 78 days?
A: The US population is a proxy for our widescale capacity to test. Once we do run 330M tests, we assume we can again quickly, having solved supply, people, and logistic issues.