Why aren't we calling the Capitol attack an act of treason?

There has been little public discussion of the term as the framework for understanding what happened on 6 January, experts say

During Donald Trump's presidency, UC Davis law professor Carlton Larson spent a lot of time on the phone telling journalists: It's not treason."

Trump's behavior towards Russia: not treason. All the FBI investigations Trump labeled as treason: also not treason. Then came the 6 January attack on the Capitol by hundreds of Trump supporters. That was treason according to the founding fathers, Larson wrote in an op-ed the next day.