score:3
The laptop rules were indeed revoked around the middle of 2017. I have flown Turkish to the US multiple times since they were revoked and there has been no need to check large electronics devices.
The email you have received from Turkish Airlines is outdated. Given how poor their IT systems apparently are, this does not surprise me. (Try using their new website to do anything and you'll know what I mean...)
Note that even when there was a need to check such devices, you did not need to put them in your checked luggage. Turkish Airlines was collecting these devices in the gate/boarding area and placing them in a protective/secure case that went into the hold, with the devices being retrieved in the baggage area at the destination airport.