The "subjected set" is the current TV that you have. They have clearly said in the letter that you are indemnifying Sony from anyone else [aka any finance company - if you have taken a loan to purchase it] putting in a claim to Sony for the "subjected set" - so, that line is nothing to worry about. What you should be pointing out is the line which says "I am fully satisfied with discount on new purchase..." - ask them what discount they are giving since there is no new purchase. If no discount is given and no new purchase then that line should be removed and they will if you point it out to them in temperate language. They are NOT asking you to indemnify them for any future defect that may arise in the replacement like people have been pointing out.
Correct!