There is no actual way of "destroying coins". Even sending to an address with a private key that isn't known, a person can also get a lot (and i mean a real lot) amount of hashpower to bruteforce the key. Although it would be difficult, the coins are still recoverable.
No they are not.
Hi if that picture is true then can someone please she'd some light for example on why a stupid thing such as a remotely managed electric car battery charger is running SHA-1024? Thanks, btw they used to run SHA-256 before...