The 2020 Customs Tariff files, including CADEX, as well as Customs Notice 19-25, are now available on CBSA’s website:
https://www.cbsa-asfc.gc.ca/trade-commerce/tariff-tarif/2020/menu-eng.html
https://www.cbsa-asfc.gc.ca/trade-commerce/tariff-tarif/2020/menu-fra.html
https://www.cbsa-asfc.gc.ca/publications/cn-ad/cn19-25-eng.html
https://www.cbsa-asfc.gc.ca/publications/cn-ad/cn19-25-fra.html