Biological Indicators

Why doesn’t biological Indicators grow at 30 to 35 degrees on specific selective media

As i am understanding Geoabacillus Stearothermophillus grow in high temperature like 55-60°c as its high survival capacity nature.
Bacillus anthracis, Bacillus cereus, Bacillus atrreophus specicies can grow by 30-35°c .

thanks