Adam J. White gives examples of Warren Buffett's own life which contradict his latest screed on taxes. It should be noted that Buffett's example is beyond stupid. Investment options include more than those which are considered slam dunks. Many proposed investments carry serious possible risks and uncertain potential rewards. The cost-benefit analysis is heavily reliant on after-tax returns.
For Buffett to pretend that all investments are obviously profitable is brain-dead stupid. Perhaps he's gone stupid in his old age. Or perhaps he thinks we're all stupid.