The post says that targeted mutagenesis is safer than non targeted. The criticism you mentioned - very one sided btw - holds true for both cases. You are right with your criticism on GMO’s but radioactivity Is a worse option than Crispr.
I admit, my arguments were cherry picked. I just wanted to provide a few counter examples to show that there are reasons for being skeptical of GMO crops. My biggest concern actually isn’t food safety or environmental impacts but the previously mentioned intellectual property implications. I don’t want Bayer to own certain genes making it illegal to plant seeds from apples I bought at the store.