The following is a case law defining Insurrection:

Insurrection means “a violent uprising by a group or movement acting for the specific purpose of overthrowing the constituted government and seizing its powers. An insurrection occurs where a movement acts to overthrow the constituted government and to take possession of its inherent powers.” [Younis Bros. & Co. v. Cigna Worldwide Ins. Co., 899 F. Supp. 1385, 1392-1393 (E.D. Pa. 1995)]

So, yes, it WAS an insurrection to stop the lawful congressional certification of a duly elected President Biden and Vice President Harris, and seizing inherent power for the loser: Trump.