The first article you link clearly refers to Warren Buffet and doesn't, in regard to taxes, refer in any way to Berkshire Hathaway.
The second article you link is titled, "Ways Professional Traders Can Save Big At Tax Time." Berkshire Hathaway is not a firm primarily engaged in trading. It is engaged in investing in companies that it feels offer long-term growth and appreciation. In some cases, their investment is in the entire company; in others, a very large percentage of its total capitalization.
Trading, on the other hand, involves buying stocks, bonds, futures, etc. for near-term resale, ideally at a profit. Stock speculation is a risky and complex occupation because the direction of the markets are generally unpredictable and lack transparency.
As has been mentioned above, we are confident that Berkshire Hathaway use every technique at its disposal to reduce its tax burden. I am confident, as well, that they spend considerable effort and expense to be certain that they are never discovered making errors in their tax returns.