You need to run an incremental repair for sstables to be marked repaired.
However only if all of the data in that Sstable is repaired during the
repair will you end up with it being marked repaired, otherwise an
anticompaction will occur and split the unrepaired data into its own
sstable.
It's pretty unlikely you will get all SSTables marked as repaired unless
you stop writing data and run inc repair multiple times.

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