Is Thomas Brezina a well-known author in Austria?

I am Chinese, and Thomas Brezina's book series The Tiger Team was once one of the most popular works by a foreign author in China, with sales even surpassing those of Harry Potter over a decade ago. Many Chinese citizens born in the mid-to-late 1990s and early 2000s grew up reading his novels. China Daily has reported on how popular he is in China: Big in China

However, I recently came across claims on Chinese social media suggesting that Brezina is not very famous in Austria and that his popularity in China far exceeds his reputation in his home country.

Is this true? Is Brezina also a bestselling author in Austria?