That survey looks at current views, not views across generations at the same age. Older people are more conservative on average, but there is evidence that millennials and Gen Z are more conservative than their parents and grandparents were at the same age: https://capitalresearch.org/article/the-conservative-millenn...
You have a good point, but that article is not convincing. Most of the claims don't consider other generations at the same age either. The statistic about abortion comes from a push poll conducted by an anti-abortion organization. The claim about Obamacare is cherry-picked from an Atlantic article about how cherry-picking polling results can make young people look very conservative or very liberal!
> "At that particular time [in the paper], however, young people were especially unlikely to identify as Republicans or conservatives because of the short-term effects of the Vietnam War and the Watergate scandal. If we exclude the 1970s from the analysis, it looks by my reading of the tables and figures as if the political attitudes of the young have remained fairly stable over time, and in some respects they have liberalized somewhat," Hopkins said about the new paper.
The idea that millennials are opposed to the ACA is a particularly misleading take. I suspect if you dig into why millennials claim to oppose the ACA, it'll largely be because the ACA is perceived as not liberal enough relative to universal health care systems.
