>retard (n) person with a cognitive disability, person with autism, neurodivergent person
Well it's great that Stanford thinks "Person with Autism" is synonymous with "Retard".
Given the specific target audience of this IT department, the nomenclature "Person with Autism" is especially controversial and likely to cause offence and the phrasing "Autistic Person" would be preferable (See [1] for more details). So the language they're suggesting in a reference is a poor choice.
The person who authored this really hasn't meaningfully consulted with the relevant groups in question enough. They would be well served reading the better style guides which already exist such as [1] which by comparison give actually useful guidance which evidently Stanford failed to find during its research [2]. Notice how this guide, which only covers one section of what Stanford was trying to cover, is longer than Stanford's entire guide. Notice also how this is presented as a GUIDE, as suggestions, rather than simply decrying certain terms as harmful.
I will note that this appears to be an internal IT department effort, so I would try to keep into context this is likely the work of some busybody who likely had no reason to anticipate international social media scrutiny. I do have to admit though, this effort simply isn't well executed enough to be advisable, and the tone is way too hardline.
[1] https://ncdj.org/style-guide/#Autism
[2] https://itcommunity.stanford.edu/ehli#footnote-3