PS, at what point would alarm bells ring for you, re this story. If they had said that they could pick up voices from a lightbulb with a telescope that was 50m

PS, at what point would alarm bells ring for you, re this story. If they had said that they could pick up voices from a lightbulb with a telescope that was 50m away? 100m? 1000m?!? I suspect that alarm bells wouldn't ring at all....