This paper is actually part of a longer series of papers made by the same authors about the relation between glyphosate and several conditions. [1]

I haven't read it entirely so I cannot vouch for its quality, but you might be interested in the following paper which does a critique of their work: [2]

[1] https://www.semanticscholar.org/search?q=Glyphosate%2C%20pat...

[2] https://www.semanticscholar.org/paper/Glyphosate%2C-neurolog...