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Regarding the word "infused", the viral particles are carried in an aqueous solution into the inner ear. The viral particles then do their work on the cells that the solution flows over. So it is literally infused, although that sort of elides the bit about the virus actually delivering the active bit of the treatment: the new gene.
EDIT: I was incorrect. It seems that the virus doesn't actually does not insert itself into the genome. Instead it forms a circular DNA loop (episome) in the cell that is like an extra chromosome. The normal DNA reading machinery can make RNA from the circular DNA loop just like it can from a normal chromosome, so you get working proteins. The benefit is that you don't risk inserting the viral DNA into a normal chromosome at a spot in the DNA sequence that would break some other protein. This is the main difference from CRISPR. CRISPR is designed to directly alter genomic DNA.
Pdf: “Protein molecules as computational elements in living cells - Dennis Bray” https://www.cs.jhu.edu/~basu/Papers/Bray-Protein%20Computing...