https://www.youtube.com/watch?v=VswFVpyg5ew
Another pilot agrees: this was software
"Boeing 787 to lose all AC electrical power due to generator control units simultaneously entering failsafe mode."
The aircraft computer uptime was 248 days. It needed to be rebooted. Yes, it that's stupid of a software bug.
A 2016 Airworthiness Directive requires "repetitive cycling of the airplane's electrical power system."
a Model 787 airplane that has been powered continuously for 248 days can lose all alternating current (AC) electrical power due to the generator control units (GCUs) simultaneously going into failsafe mode. This condition is caused by a software counter internal to the GCUs that will overflow after 248 days of continuous power. We are issuing this AD to prevent loss of all AC electrical power, which could result in loss of control of the airplane.
https://www.federalregister.gov/documents/2015/05/01/2015-10...
https://www.federalregister.gov/documents/2020/03/23/2020-06...
https://www.federalregister.gov/documents/2016/12/02/2016-29...
This reads like speculation with regurgitated old news and insinuations.