The reason it's in the {boQwI'} database is because there are several users who use it to read KLI mailing list emails, and *{yaDpach} has been used enough times as if it were just a normal word that people expected it to be analysed.

Much better would be if people seeing yaDpach would look it up and find no entry at all. The meaning would be clear: it's not a word.

Look at who the author of these threads is:

{yaDpach DIngDaq tI DuQwIj} - https://www.kli.org/tlhIngan-Hol/2000/October/msg00073.html

{be'nalwI' yaDDu'} - https://www.kli.org/tlhIngan-Hol/2011/August/msg00001.html

Which just goes to show the level of confusion this non-word has caused, when one of the people arguing against it has been using it himself. If charghwI' doesn't recognize a non-word when he uses it, what chance does a new student have?

{boQwI'} isn't only a lexicon but a grammar and word analyser, but it's used by people to read things authored by people other than Marc Okrand.

But most people don't understand that. No matter how many "not canonical"s and question marks and asterisks you add to it, someone who looks up toenail and finds yaDpach isn't going to look at the fine print... or if they do, they'll say, "But I need this word, and here is boQwI' offering it to me."

-- 
SuStel
http://trimboli.name