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)."