maximum contango topic, amount, someone, limited, precious

segalm

Please, can someone explain this topic?
Futures price = 100* 1.05 = 105

For most commodities that can be readily purchased at spot and stored, such as precious metals, this repesents a theoretical maximum price., the amount of contango is limited to 5.

If the futures price exeeds 105, investors will sell futures and buy spot until the price is back to equilibrium.

why sell futures and buy spot?