It's a completely BS statement, so I don't know what you're trying to say. It's not even possible for reality to have a bias in the first place. Reality just... is. It's the people who try to tell you what reality is that have biases.
It's glib, but the meaning is that rational observation tends to strongly disfavor conservative views. Things like climate denial and supply-side economics that are tentpoles of conservatism consistently fail to hold up to any level of scrutiny. Modern American republicans are currently hanging their hats on completely farcical assertions that the 2020 election was stolen and Democrats are all pedophiles. When an outlet like CNN reports the truth, they are going to appear liberal in comparison.
That's not what it means. It means that rational observation free of bias aligns more closely with liberal politics.
Per the examples given: Scientific observation says climate change is real, man-made and an urgent threat. Liberals agree, conservatives don't. Maybe not to a person and maybe not with 100% fidelity to the science but the trend is unmistakable.
Same for many other conservative fallacies like "tax cuts pay for themselves". We have data and know it isn't true. And current hot topics like election fraud. All the evidence says it's extremely rare. Liberals agree with the evidence, conservatives don't.
That's not the entirety of the political divide and there's plenty of subjective and philosophical arguments irrespective of evidence but when it comes to justifying policy, one side relies on evidence one doesn't.