[candiodari]

First: Injecting RNA into cells that currently have reverse-transcriptase proteins active? I'm afraid it will modify DNA. So in any cell currently infected with a retrovirus, and there will be a lot of those in any human, it will modify DNA.

Of course, no more (in fact significantly less) than the virus will. But mRNA vaccines, when used against a retrovirus, will modify DNA.

Second: it would be considered Gene therapy whether or not it modifies DNA.

Thirdly: all RNA activity will result in expression changes for other Genes. That might not modify the DNA directly, but most researchers now consider that part of the genetic material of the cell. Again, probably a lot less than a virus would.

Fourthly: all "negative" (meaning it cuts out "wrong" DNA rather than adding some) gene therapy treatments only inject RNA as well. It's not quite the same as an RNA-based vaccine.