There is need for key-in to reset text justification(or other) override value back to text style. To reset all the text elements so override values are not used, it requires going through each text style with Change Text attributes command.
There is similar key-in for dimensions: change dimension justification fromstyle
key-in:dgnlib update textstyles doesn't work in this case because if text element attribute is independent from style then it is not reset to style.

/cfs-file/__key/telligent-ideas/d5d6c2ef-925b-4a51-8509-a07c253d4226/text_2D00_justification.zip