The most important thing that I have deduced from the information contained in that blog is that, in truth, no alleged virus has been isolated through direct observations (what basically means purifying the alleged virus and showing the replication of its alleged particles).

Does that mean viruses don't exist?

Not necessarily, their existence could be inferred through indirect observations, in a similar way the existence of electrons or exoplanets can be inferred with this type of observations.

The indirect observation to which virologists "grab" to support the existence of viruses is their supposed genomic sequencing.

I develop this matter in another forum thread:

"Genomic sequencing", the dubious thing to which virologists grab to claim the existence of viruses