I have seen the OECD list that relates to information disclosure. However, there are other factors to be considered in determining which countries are tax havens, in particular a tax rate that is much lower in relative terms.
If you look carefully, you will see that other organizations have also ranked tax havens, and the OECD may be the organization that is least demanding in that regard. In my study, I give the names of other organizations that also identify tax havens, and the OECD is one of the least demanding.