What does the red part mean?[/quote]
You quoted this sentence out of context and without reading the entire news article, it is hard to figure what the red portion really meant. The 盲點 (inadvertent error; oversight) refers to the poor implementation of determining statistics based on signature lists of attendees at legislative meetings. The sentence you quoted then go on to say that “under this scenario, it is definitely possible for [color=red]an error to occur where[/color] a legislator shows up to sign his/her name, [color=red]but in reality did not attend the meeting[/color]”.
Statistics can be crude if they are taken using crude methodology. Determining a nation’s voting patterns based on a survey of your own personal friends would be considered “crude statistics” (i.e. not accurate).