That's fair, if a bit strong - this one has more [1].

"Separately, FDA chemist Narong Chamkasem found “over-the-tolerance” levels of glyphosate in corn, detected at 6.5 parts per million, an FDA email states. The legal limit is 5.0 ppm."

Here[2] are the FOIA documents they're citing.

The original article does link directly to an email with the 6.5 ppm figure[3].

[1] https://www.theguardian.com/us-news/2018/apr/30/fda-weedkill...

[2] https://usrtk.org/pesticides/fda-foia-documents-regarding-gl...

[3] https://usrtk.org/wp-content/uploads/2018/04/Over-the-tolera...