If you're going to reference papers from 2004, you should likely follow up on their subsequent citations and refutations:

2007 paper that specifically cites Hróbjartsson et al., but claims that they overlooked certain specific effects:

https://bmcmedicine.biomedcentral.com/articles/10.1186/1741-...

2019 review that also cites Hróbjartsson et al., but catches up on subsequent and broader placebo/nocebo research and concludes that both still seem efficaceous in the right contexts. https://www.frontiersin.org/articles/10.3389/fpsyt.2019.0036...