Earlier quoted context omitted.
The value of a corporation is inevitably linked to its profits.
Not really. Amazon, a company I once knew a bit about, showed gigantic growth in stock value with minimal or zero profit. This is hardly a new story. But it wouldn't matter anyway, given GP's point. Taxes on corporate income are not taxes on the capital gains of those who hold corporate stock.
The stock price can deviate for a time from the current profits, but it will inevitably move back to what the overall profit is.
The reason is simple. The gains in value of a company are when (revenue > expenses), i.e. it comes from profit.
> Taxes on corporate income are not taxes on the capital gains of those who hold corporate stock.
Yes they are, because they reduce the value of the stock (and hence the capital gains) by the same amount. There's no free lunch.