thermodynamics - Would a pin head heated to 15 million degrees Celsius kill everyone in a 1000 mile radius?

The YouTube video How Hot Can it Get? contains, at the 2:33 mark, the following claim:

A pin head heated to 15 million degrees will kill everyone in a 1000 miles radius.

On what basis can this claim be true? Some of the things I can think of:

1. 
   

   Radiation of the metal as it cools down

   
   


2. 
   

   Energy released in fusion (not sure if this works for an iron pin)

   
   

Would the damage be only to organic matter or will it destroy other structures within that radius?