His post is here: https://forum.inaturalist.org/t/a-guide-to-inaturalist/50517
But if the reference you mean is Roger, E., Kellie, D., Slatyer, C., Brenton, P., Torresan, O., Wallis, E. and Zerger, A., 2023. Open Access Research Infrastructures are Critical for Improving the Accessibility and Utility of Citizen Science: A Case Study of Australia’s National Biodiversity Infrastructure, the Atlas of Living Australia (ALA). Citizen Science: Theory and Practice, 8(1), pp.1-35. then I think the “accessibility” in the title is referring to being able to easily obtain and use Citizen Science data.