I didn't deny what was in the link, I just noted that the title didn't include "virus purification". I didn't notice that they did include those words in the body of the article. In any case, anyone can -say- that they are 'purifying' a virus, but without solid evidence that they've ever actually isolated a virus, it's just words without evidence. I did a search on your article, it did not include the words "isolate" or "isolation", so they don't even claim to do these things.
As I just mentioned, your first "sample" didn't even claim to isolate a virus. Moving on to your first link...
That link does indeed claim to have isolated various viruses, but doesn't provide compelling evidence that this has actually been done. They mention isolated or isolation 4 times. I think the 4th time is the most revealing:
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Advances in vector design and the various commercially available baculovirus expression systems permit simple, recombinant virus production, with some systems negating the requirement of virus isolation and purification.
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It seems that here they are perhaps at their most honest, as they recognize that what is going in is not really virus isolation or purification and they're just giving themselves license at this point to do away with both because they think they're not really required to show solid evidence that biological viruses actually exist.
There is- as mentioned previously, RNA is found in a lot of cells.