This has been an on-going argument for many years. The author is stating his opinion on the safety / non-safety of the commercial weed killer named Glyphosate(r) (not glyphosphate).
I think it worth your time to read the article which does contain multiple references in support of the opinion.
You must decide for yourself, the food police should not have a voice here...
https://survivalblog.com/hidden-danger-grain-storage-z-h/I have an opinion on this product, however I'll reserve stating it unless I must refute an argument with which I disagree.
If nothing else, you may learn something about horticulture and food storage which may help you in the future.
[edit] spel none gud