With a few SMR projects built and operational at this point, and more plants under development, the Institute for Energy Economics and Financial Analysis (IEEFA) concludes in a report that SMRs are “still too expensive, too slow to build, and too risky to play a significant role in transitioning away from fossil fuels.”
The investment risk is directly related to cost overruns and delays, which are already stated.
On the other hand, a major point of these projects is how they significantly reduce the risk to humans and the environment compared to other nuclear plants, so I don’t think I’m alone in expecting the “risk” in the headline was referring to some rebuttal of their claims, but that is not the case.