I think they consider the postulates "out-dated" because they can't consistently meet them as often as they'd like. The postulates were getting in the way of discovering (and profiting from) new deadly viruses. In the methodology section of the paper you linked you can see they used the tried and tested method of assuming the virus was present and the cause of disease before progressing with the "isolation" - if one adhered to koch's postulates that assumption could not be made, and therefore the "isolation" of the virus would fail.

https://projekt-immanuel.de/en/is-it-really-true-that-sars-cov-2-has-not-been-isolated/