Generation Z may be more conservative than Millennials, but this poll above is from the UK, not the US. Since these are issues that have moved to the left recently, Generation Z likely has a different reference point for some of them, such as transgender rights. To a Baby Boomer, a "liberal" position on transgender rights might be, accept transgender people as the gender they want to be called, whereas to a Generation Z person, it might be, No Platform anyone who claims that ciswomen have a different experience than transwomen. To a Baby Boomer, supporting the legalization of gay marriage might be a liberal position, whereas for a Generation Z member, it might be a moderate position. In support of this theory, here is a source that claims that
80 percent of Gen Z'ers support gay marriage, which is quite high (albeit focusing on the oldest Gen Z cohort). We would have to ask about discrete issue positions to get a definite answer.
Also, the methodology this poll is somewhat suspect, as it found only 2% and 1% of Millennials and Gen X'ers have a conservative stance on these issues, only 2% of Millennials and 6% of Gen Xers hate tattoos and body modifications. Just from personal experience, body modifications have always been somewhat polarizing among Millennials. My guess is, if you take a group of people who have less familiarity with certain issues and haven't thought about them much, and present them with five categories, it's going to be very hard to get any of the five down to 1%, 2%, or 5%. Someone who is not too familiar with an issue, as the youngest cohort are more likely to be, might conceivably put moderate just to be safe. Which is not to say that these results aren't valid, just that it might not be as dramatic as it seems.