Language can and does gradually change over time and new words do get added but you are simply using the incorrect word, as conflate is already often used to merge things in error.
The best *reasonable* metric you can use is if other people have used the word you are describing before
spoiler alert the google ngram viewer returns 0 results
Unless a bunch of people just randomly start using misconflate in 2021 you are indeed just using a word that does not exist, even if said word has an intended meaning.