Asylum seekers, not immigrants. This is a group that has been brutalised in some form, so are more at risk of passing on the violence.

No it doesn't. It's just part of a pamphlet informing people of the rules/laws of this country that might differ from their own and it includes the main laws that immigrants have been known to not understand when applying for/given asylum in the UK.

Also, there's no point handing it out to British nationals. If they were raised in this country they should already know what constitutes rape and that it's illegal. A pamphlet isn't going to change that

That's what any reasonable person would infer was the controversy from the headline. The actual controversy is "deport them instead of telling them about inclusiveness." The pamflet also says these are expectations of nationals and who to contact if it happens to them.