W8JX,
From the sounds of it he is NOT causing the problem, unles one considers operating within the scope of his license causing.
Eample, I once had a home intercom that received the local AM radio station every morning when propagation was right. Was hat the fault of the commercial station, I was 1 mile direct distance from their 5KW transmitter.
Therefore, citing this as an example, it may not be his fault.
KF7CG