> It's not cherry picking, I just didn't add a whole chart.
It is cherry-picking. As I said, there are multiple, decades-long peer-reviewed studies on this topic (which is not what you linked). Raw numbers don't mean a whole lot for comparative studies, because confounding variables such as basic demographic differences will always swamp whatever effects you're trying to observe. Peer reviewed studies measure and account for these; a news site reporting raw statistics does not.
> climate (most of the country is frozen for half the year)
I have no idea how you're concluding that this affects survival rates for cancer.
> The uninsured don't count towards cancer rates if they don't receive a diagnosis. If you're uninsured and losing weight, anemic, night sweats, and your doctor says it could be serious so you walk away because you won't be able to afford it, you don't count as a cancer diagnosis. Assuming you went to the doctor at all. That does no count against my point.
Late diagnoses mean inferior care, and higher mortality rates. It's very rare for people to die of cancer that is neither diagnosed nor detected at any point, including upon death. This isn't speculative; it's a topic that is extensively studied in public health. Again, this is addressed in the studies conducted by professionals tasked with answering this exact question about cancer survival rates.
It can be tempting to start from a prior ("the US healthcare system is less affordable than Canada's systems") and then find explanations that fit that prior ("people don't get diagnosed with cancer because they can't afford it"), or search for data which supports that prior. Unfortunately, that's a logical fallacy, and it often leads to conclusions that are contradicted by the hard evidence at hand - which is what researchers have found.
On that note, you may be surprised to learn that healthcare in Canada is not, in fact, universal. An estimated half a million people in Canada do not have access to healthcare. That's actually slightly higher than the uninsured rate for the elderly in the US (which is the cohort for which the overwhelming majority of cancer diagnoses occur).