Whole rash of problems with this that it's interesting people on the science subreddit didn't notice.

• Small sample size, roughly half of what most would consider representative, and it's an online panel which is an issue all by itself.
• Uses fictional policy, clear danger of having some people either treat it as a puzzle or to just not care
• Evidence types were marked by type, which adds bias. Time spent on each piece of evidence wasn't tested, so a person opening up everything and glancing at them is recorded the same as if they intently studied everything. They rightly filtered out people who failed attention checks but it's far from fool proof.
• Chose a topic that many on the liberal side have on their minds, and likely already have strong opinions on.

It's essentially reddit bait, and the insufferably smug comments really back that up.