Well let's look at the title of the page:
University of Western Australia - NO Record of Isolation or
Purification of CoV By Anyone Ever!
As proof of this claim, they show the response of a FOI request made to University of Western Australia. The request, in part, asks for all the evidence they have of any study or research by anyone/anywhere. The University's response on that point is to point out that it is out of the scope of a FOI request for them to be responsive to an anyone/anywhere search. (The document on the page is an image and I, frankly, don't feel like retyping it all out.)
So just on the face of what is claimed, by simply reading your own "proof", it fails to meet what is claimed. The most you can claim is not that Covid doesn't exist, not that there no record of isolation by anyone ever but simply that the University of Western Australia has seemingly not done it.
Here are papers about the isolation of the virus.