Seriously you'll be hard press to find a paid translator that can translate technical documents.
Also the document is actually reasonable coherent. Picking on the language level of the document over the technical content of the document seems kind petty.
You'd hope they'd have a good technical translator already on their payroll.
Japanese is one. I've many times read comments written in Japanese in the Ruby language source code and understood their meaning, but there is absolutely zero ability for me to visit that country and be able to interact with anyone.
The author of this incident report is leagues more capable than I am in writing a report in a foreign language. They didn't insult my mother, or my dog, or call me names by accident. I don't see the justification in insulting their English.