There are tons of SARS-CoV-2 isolates. It took me about a minute to locate two papers detailing isolation of the virus:

* "Severe Acute Respiratory Syndrome Coronavirus 2 from Patient with Coronavirus Disease, United States": https://doi.org/10.3201/eid2606.200516

* "Isolation and characterization of severe acute respiratory syndrome coronavirus 2 in Turkey": https://doi.org/10.1371/journal.pone.0238614

The website also has an article titled, "Die Virusexistenzbehauptungen von SARS-CoV-2 sind eindeutig widerlegt," which translates to, "The claims of the existence of the virus SARS-CoV-2 are definitively disproved."