SIV viruses, like HIV have recombined with each other: https://jvi.asm.org/content/82/4/1923
Viruses recombine with cells and each other:
https://www.frontiersin.org/articles/10.3389/fpls.2013.00068/full
I don’t have time to plow through my bookmarks to find the paper with the specific cite in it, but I suggest you read this: https://core.ac.uk/download/pdf/80860956.pdf
HIV and coronaviruses have been around, in people at the same time, for 50 years or so.
There are labs that do nothing but find and sequence coronavirus variants.
Have never seen this before.
That all 4 of these insertion peptides are in the binding region is like winning the lottery.
And this virus just so HAPPENED to win the virus lottery a few clicks from a BL4 lab.
In a country that’s lost BL3 viruses before. Recently.
I’ll let you take those odds. I’m out.