I have read through these and have a few thoughts.
First if TRUMP did instigate the Insurrection Act, as well as instigation emergency declarations in numerous states based on past events, to by pass congress, to use US military in certain states, BIDEN would have been able to IMMEDIATELY end the insurrection act as soon as he became president. This did not happen as these codes are still Active as of today.
This leads me to believe two possibilities.
A) Trump used the video message asking "People at the capitol" to leave and to peaceably go home, yet he was actually talking to the joint session that was stealing the election. This is textbook fore notice of declaring an insurrection. So its likely he instituted it on the 6th/7th while congress stayed up late certifying the electoral votes.
Go back and re watch the video, but when watching it imagine he is talking to the joint session and not the protesters. It makes a bit of sense. Especially the end.
Biden being a part of the insurrection, would likely not have the power to undo the insurrection even if he was inaugurated. I believe this is what is happening because Biden has NOT revoked the insurrection act which would be priority #1. This also makes sense why Nancy Pelosi was so eager to get Pence to invoke the 25th, so he could end the insurrection act before the inauguration, knowing Biden wouldn't be able to.
B) This is all just pertaining to the National Guard in DC and a form of the insurrection act was put into place to allow US military to assist in the Inauguration security. Would also explain why Biden has not undone the act.