>>12490177φιλία is the suffix which translates to "brotherly love" so your original question is "Does having sex with angels count as dead brotherly love?" sounds more silly since you're trying to focus on the original latin meaning.
The correct latin term if such existed would be νεκρόςἔρως due to the suffix ἔρως making it "dead sexual love" or to be in love with a dead thing sexually.
Mexican intellectuals everyone.