Windows 10 IOT Core isn't. Windows 10 IOT Enterprise is though[0]. Good luck getting a legit license for it however.
It’s possible (with much effort) to get a legit licence for Windows 10 Enterprise LTSC.
But just get an evaluation copy, promote it to volume and KMS activate it and save yourself the hassle.
If you really need LTSC for prod they are available too as such :)