I imagine the interference isn't nearly as bad as with electronic ballasts, though?
It is not that straight forward.
The electronic ballasts are usually designed with the RF disturbance in mind (it does not mean there are any special components for that, just well chosen topology is way more efficient than tons of additional filters), but usually eliminating the problems from the lamp itself (no reignition)
With the magnetic preheat it strongly depend on the lamp itself. Some tend to form quite powerful RF oscillator, some don't, sometimes a capacitor parallel to the starter may help,...
Generally the "problem maker" with low frequency ballasts is the reignition after the current zero crossing, while the HF drive does not suffer from that problem at all.
