NO It is NOT! Before you lose all credibility, let’s just stick to the facts here. How about we go from the science at the Center for Disease Control, and their flu FAQ.

Also you don’t need Doctor’s advice to get a flu shot. A flu shot helps other people too, not just you. Because one less person getting it is one less transmitter. Less spreading, less pandemic, get it?

FTA:
http://www.cdc.gov/flu/about/qa/flushot.htm
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The viruses in the flu shot are killed (inactivated), so you cannot get the flu from a flu shot. The risk of a flu shot causing serious harm, or death, is extremely small. However, a vaccine, like any medicine, may rarely cause serious problems, such as severe allergic reactions. Almost all people who get influenza vaccine have no serious problems from it.
What are the side effects that could occur?

* Soreness, redness, or swelling where the shot was given
* Fever (low grade)
* Aches

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Tai chi may be good, but this article is poor. Start doing the research at the official sources. There is a lot of science and funding behind the flu shot, because people care about health.