I imagine they are using visible light to make the demo look better.
My charger delivers about an amp at 5V, are these goons really suggesting that they deploy a ~5W laser to charge phones around unprotected humans. Now do it in IR so they have absolutely no warning, just suddenly go blind from either a direct hit or a reflection. Really, what could possibly go wrong ?
You can get replacement parts for iphones, I just replaced the charging connector on my wife's phone 4s, I had to buy a special toolkit (fancy security screws) but the instructions were straightforward and easy to follow and the actual part (an integrated assembly in itself) was large enough to handle.
To be fair, grandpa is unlikely to have faced these issues since it's advances in manufacturing that have made these highly integrated devices affordable and put them into so many hands. If he had been faced with the task of repairing, say, a Rolex watch then he would have been woefully under skilled too, but he wasn't because Rolexs are the preserve of the wealthy few.