@tobybellwood. After your useful feedback, I have updated the review to include a comment that the data is available in html. However, as you may have noticed there has been no change on the survey itself as html is no longer one of the options for machine readable formats (because it can be difficult to scrape the content).
As per the other source you indicated, it does not appear to be a government source and so it is not relevant for the purpose of the index.