The kind of wood used here does not burn like normal timber. Its treatment gives it strength and fire resistance. There are some large scale tests that need to

The kind of wood used here does not burn like normal timber. Its treatment gives it strength and fire resistance. There are some large scale tests that need to be done yet, in order to better understand how a fire would behave in a midsized wood building. It's all in the article. Keep in mind, this is way more testing than usual, lots of other materials have been used in large buildings, sometimes with disastrous consequences (see: Grenfell Tower fire).