Yes, the information from the other site is incorrect.
This matter has been raised many times before on AB (can't be bothered to look for the questions). An insurer cannot invalidate the compulsory element of your insurance cover because of the commission of another offence, with the exception of a person driving whilst disqualified from holding or obtaining a licence.
If they could, every motoring offence prosecuted such as no MoT, faulty lights, speeding, careless driving, no tax etc etc would be accompanied by the far more serious offence of No Insurance. And a vist to your local Magistrates' Court on traffic day will show you that this is not the case.