I don't see what the problem is with people speculating. He didn't claim to know what happened. He made clear he was uncertain what happened and offered a possible explanation without alleging to have some ability to know the truth.
I don't think it's too different from reading a story about a murder investigation and idling throwing out 'could be Bob that did it - I hear he gets angry sometimes' without knowing Bob, knowing whether he usually gets angry or not, whether or not he was angry or not at the time, or whether anyone was angry at all in the situation or even if Bob had anything to do with it in the slightest.