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Because that's what my online dictionaries are telling me. I assumed it traced to the DSM (or some specific psychologist's theory/work).Any reason?
https://en.wiktionary.org/wiki/delusionary
"Delude" and "delusional" etymologically precede the discipline of psychiatry:
https://www.grammarphobia.com/blog/2010/12/deluded-delusional.html
So if it's not the DSM thing, my simplest guess is that it is intended to add a dimension of imperfect tense to "delusional"; suggesting, maybe, that someone who is delusional might only be that way temporarily, or about a certain thing, whereas "delusionary" suggests one has a tendency to always gravitate towards that mindset, with everything, or alternatively to do so in perpetuity.