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Dictionaries are descriptive, not prescriptive. They don’t decide if something is “acceptable”, just if it is widely used enough to report. If a mistake becomes common, it will enter the dictionary.
According to Merriam Webster, “thru” is an acceptable, albeit less common, variant of “through”. https://www.merriam-webster.com/dictionary/thru
Dictionaries are descriptive, not prescriptive. They don’t decide if something is “acceptable”, just if it is widely used enough to report. If a mistake becomes common, it will enter the dictionary.