Many larger enterprises are using git flow style processes but calling it trunk based?

Lots of incentives towards longer lived feature branches

What are the incentives you mention?

Anytime I've worked on long lived branches chaos is doomed to ensue.

There is huge array of alternatives between git-flow and trunk based development.

Most still miss on benefits TBD and CI bring.

Companies settle in the middle because git-flow is very specialized branching strategy. You almost need physically sold software (but that's still not enough!).