This is explained in the pdf:
"DELEAT
1. Alternative spelling of delete (verb: remove or obliterate written or printed matter, especially by drawing a line through it or marking it with a delete sign; remove data from a computer’s memory; noun: a command or key on a computer which erases text).
2. A portmanteau composed from the words delete and eat.
3. Latin: third-person singular present active subjunctive of deleo (verb: destroy, annihilate, extirpate; finish, terminate)."