Welcome AKSAR.

You make a good point, its interesting that the partner self rescued, but without the details its hard to judge the situation.

From a closer reading of the article, it looks like the two climbers may have been seperated, and perhaps one panicked a little ?

It could be that the rescued climber was exhausted and couldn't move, or perhaps lacked the confidence or equipment to continue.

Looks like the other self rescue climber proceeded appropriately and was safe. Perhaps you're right about a case of use it because you can, not because you have to, if he didn't have the SPOT perhaps he would have been able to self rescue too ?