I don’t think this is real. “deltacron” isn’t a greek letter and viri can’t combine like that.
I mean its not that uncommon, though you are right that such a drift of genetic material would also have a hard time reconstituting itself into a new virus. Virus produce so many copies of themselves within our bodies that genetic drift is going to happen; If you flip a coin a trillion times youre going to have a couple of strings of 100 head results in a row.