I don't think that the essay refers to basic RNA splicing, but much more complex transcription templating.
If I remember correctly, cephalopods have an absolutely enormous amount of RNA editing going on, but it's so much so that their coding DNA is essentially fixed, because if any of it changes all the RNA editing falls over and they're non-viable.
If I remember correctly, cephalopods have an absolutely enormous amount of RNA editing going on, but it's so much so that their coding DNA is essentially fixed, because if any of it changes all the RNA editing falls over and they're non-viable.