Joule heating /Ohmic heating
I'd say it's about naming stuff.
Ideal resistors follow 2 main laws:

Ohm's law which dictates the relationship between voltage and current.
$$U = R.I$$
The power dissipated accros the resistor (as heat).
$$P = U.I$$
Dipoles following Ohm's law can be called 'ohmic conductors' and these are subject to heating given by the power formula above.
'Ohmic heating' thus refers to heating by appliying current to an ohmic conductor, or in simple terms: heating of a resistor traversed by a current.