This was what I read. It does have that "or states with community spread" caveat though.
https://www.health.pa.gov/topics/disease/coronavirus/Pages/Travelers.aspx
Coronavirus and Travel in the United States
Should I travel within the US?
It is recommended that if you are returning to Pennsylvania from New York, New Jersey, or states with community spread of COVID-19, to stay at home for 14 days and self-monitor for symptoms.