Here is the definition of divesting.
You seem to be confused about what individual carbon footprint is because you’re talking about business choices as if they are an individuals choices.
Business owners divesting has nothing to do with an individuals carbon footprint.
If you can put pressure on your pension provider, local government, church, favourite charity or any other organisation you care about to drop funds with them in entirely then all the better.
This is accomplished by group action and legal/political pressure which is the opposite of reducing your individual carbon footprint. That is the systemic change I am saying we need.
Not telling people they need to walk to work so they don’t burn fuel. Or get solar panels to stop funding coal, when they live in an apartment.