This adapter is not compatible with displays that use DisplayPort or Mini DisplayPort, such as the Apple LED Cinema Display. Thunderbolt and Thunderbolt 2 are not the same as Mini DisplayPort , though the ports have the same shape.
from:
About the Apple Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter - Apple Support
That adapter ONLY works with genuine ThunderBolt displays. It does not supply a Mini DisplayPort or any other usable display signal in either direction, and can NOT use ANY display adapters to get them.
You don't need that adapter.
Your display has a genuine ThunderBolt-3 input, and
Your computer has four genuine ThunderBolt-3 outputs.
Buy a genuine ThunderBolt-3 cable, and live happily ever after.