Well, first off Buffet isn't the only decision maker at his company (after all, if the president of a company can be held liable for every decision then Rupert Murdoch would be in jail right now) but more importantly is the fact that his op-ed was dealing with personal taxes, not corporate taxes. Though I personally favor raising both, the article you link shows no hypocrisy whatsoever. What it does show is either an inability on the part of the author to understand the matter at hand or (more likely) a desire to twist the facts to suit a particular agenda.
My favorite part of the article you link...
Interesting questions for the man who professes to want to pay more to Uncle Sam, and who sees fit to raise the burden on all job creators
How much longer will the sheep buy the whole "job creators" line? The last ten years have seen a major decrease in top marginal taxes AND a steady downward trend in US employment. Obviously the two issues do not affect each other in the way that these clowns want you to think.
Of course, in fairness, he didn't specify in what country or at what pay scale these jobs were being created, so if you are interested in giving big tax breaks to people opening factories in China or India, by all means stick with the Republican platform of the last ten years.