Burying trees is too unwieldy to be practical. Burning the trees and capturing the resulting co2 is more feasible. It's an example of BECCS, bio energy carbon capture and sequestration, some argue it's a practical solution.

Your plan don't have the ecological and geological risk of pumping acid into the ground.

You cant get VC funding without risk.

One reason, and not a very compelling one, is that trees in certain latitudes exacerbate global warming by absorbing more heat than naturally occurring grasses (which tend to be more reflective).

In sum, it’s not better.

Its not, but we are slowly becoming desperate and rich ppl feel like they have to have a plan B in case Earth becomes unhabitable.

Do that but with spent nuclear fuel. A few million trees compressed into a barrel.