The early classification is accompanied by a historical observation that a few extremely short surahs, consisting of one, two, or three verses, were in some arrangements attached to a preceding surah. One should distinguish the identity of a surah from a report about its placement in certain early arrangements.
The observation concerns the history of surah grouping and the written muṣḥaf. It does not justify a general claim that all short surahs lacked distinct identities or that present muṣḥaf boundaries may be disregarded.
The interpretive lesson is methodological: reports about early compilation or arrangement require attention to their precise wording and scope. An isolated historical detail should not be turned into an unrestricted rule.