“The 1000 ohm and 3300 pf capacitor is there for a reason. This "smoothing" of the gate drive edges will significantly reduce RF noise generated by the MosFet switching. If you look at the time constant of the RC (ignoring the gate charge for now) the RC is 0.033 µS. Hardly enough to Heat the MosFet. Especially if the switching frequency is in the order of 200 Hz.”
This is just misleading and deceptive, it belongs on the Instructables web site along with all the other information they spew there.
Many users use PWM with LEDs, the frequency is 490Hz and 976Hz on the UNO.