Yeah 4 times 0.0000000000000000000000001% of what the largest companies produce.
A single individual? Sure, but that is a bad comparison. World wide food production is responsible for over a third of all carbon emissions. That isn’t inconsequential.
But one person stopping eating meat compared to one company making a change. Heck one company adding solar panels to one office building is still probably going to make a bigger difference than one person going vegan.
Can you get companies to install solar panels? Few of us can, but (almost) anyone can go vegan. And even if you can influence corporations to reduce emissions, you can still go vegan! It’s not either/or
Do any of those companies help to produce beef?
Most companies create products to sell to consumers.
But they all produce greenhouse gasses. And a single one of them produces way more than a person going vegan is going to save.
The point you seem to be missing is if they can’t sell as much meat they won’t produce as much. So the most the consumer can do is stop eating meat; when sales go down, production will have to follow.
Meat-eating has a heavy cultural component and industry follows culture, but the problem is that industry also tries to create culture to grow, it’s the way capitalism works. So as a consumer in the age of information you have to be hyper aware of your own personal culture, and see how much your actions are a result of your own convictions versus effective advertising and indoctrination from your environment, family, etc.