Hard to prove any of this without extensive tests.
The closer you are to the rx, the less power you will need to jam the signal. But you had to feed in noise over the whole frequency spectrum constantly, which
our ignition systems would hardly be capable of. There is a slight chance, but it's almost impossible.

More likely you will catch some spikes through a servo or battery lead. The root cause might be a faulty shield on the spark plug cap or lead, the result is your servos twich.
I bet you some people don't even know that this is happening. My plane flew fine, the control surfaces would slightly jitter when the engine was running, it looked like this was caused
by the engine vibrations. It would fly fine, once I ran the engine with the canopy off, I notice that the servos moved.

And the servos were Futaba 3251, with a 617 rx, not a high end system, but you'd expect e decent quality here.