Telling someone to fuck off and die does violate the letter of the “no wishing death” rule, as would telling someone to “drop dead”, another commonly used expression which is usually not intended literally. If we’re going to have a “no wishing death” rule, it’s hard to see how to make exceptions for colloquial expressions which can be enforced consistently.
That said, it’s the sort of thing we’ll often let slide, unless you appear to be intentionally trying to push the boundaries or are just generally acting like a dick.