As far as I know, it wouldn't be possible for type to "reflow" in any PDF the same way it does with more editable document formats (words moving from one line or page to another and hyphenation changing). Each text line is always an independent object and there is no concept of a text frame or linking. A line of text begins at a given coordinate and its length is determined by the interpretation of the font. The characters can change from one font to another, or one glyph to another, and their position in the text line and scaling can change, but it would be as difficult for it to actually reflow as it would be for lead type.
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