You've got it backwards. Authoritarianism isn't a "dead body" - it's metastasizing. Every minute brings new regulations, new surveillance, new "safety" justifications for control. The merger of state and corporate power isn't authoritarianism dying, it's evolving into something more total and harder to resist.
Discussion
State is a corporation, ever was. Individuals claim you have to follow their rules, claiming they have the authority from a dead body. You can’t show me state, it not exist, authoritarianism came from these individuals. Fear is a strong weapon.
Nation States are contracts, given jurisdiction over land by international convention. Plant a flag, claim to control the rules, nobody else can claim other rules within your sandbox.
Corporations are contracts, given jurisdiction over a copyright/patent/trademark by nation states, and enforcing that jurisdiction in order to accumulate capital to give to shareholders.
Authoritarianism is when claimed authority becomes self-perpetuating through the abuse of capital, the forces that control and amplify the movement of information.
When governments take over business, we call it communism sometimes. When businesses take over government we call it regulatory capture. Both are fascism, and both lead to authoritarianism.
The only defense against this is a combination of rights that must be demanded. The right to exit, taking control of our capital outside of the influence of either nation state or corporation. The right to fork, taking control of the rules that apply to how we interact with others. The right to verify, giving us the truth from the source, not claims from people we can't trust. The right to sustain, protecting our foundations from those who would extract for their own profits.