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.
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This is a exclusive problem for the US. A County with a working justice system would acknowledge biological gene mobility and the natural reproduction cycle. That means farmers will be able to grow plants out of their own seeds as well as cross the mutants with relatives to keep the benefits alongside biodiversity. This is of course no business model but open funded research could do it as well.
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Most scientists have a strong opinion against herbicide resistance (like round-up, round-up-ready). These genes are very quickly found in other plants do to gene transfer so it's only a short short sighted solution.
PS: Glyphosate is the best herbicide we know. Your argument is valid for all herbicides but with roundup the least.
This implication has two problems:
This handling of new technology's has always been like that. The first nuclear reactor was build bevor they knew if it even works. No body thought twice about the danger. The difference here is that it benefits poor people more than rich so most people don't care really.
In the case of most non-competitive mutations we know exactly what happens. Because this argument is so old, we now have detailed study's on gene mobility like vitamin A enzymes. Because the plant can't use that much of it, the gene is silenced very quickly. That means that your crops will yield yellow and white seeds. The farmers have to plant only yellow ones ore the genes can hardly be found on his field after a few generations.