Balus, a helpful response.
Thoughts for comment from non type rated, but Cat 3 qual pilot many years ago.
NO FLARE annunciation; presumably from an automatic detection and alerting system which can be generated prior too and at flare commence.
The monitoring pilot's 'No Flare' callout presumably relates to an assessment of either the lack of Flare annunciation ( if applicable in that aircraft type ), or that the aircraft does not flare at the expected height by judgement of the expected aircraft motion after that height.
The latter condition might be difficult to assess if the auto-land system uses a variable flare height ( small adjustments made for wind / ground speed correction ), and / or dependent on the foibles of human judgement - can be mistaken, a late call, or 'what if' called too high …
Re options to continue visually; what recommendations are made re reported visibility, e.g if Fail Op (Cat 3B) presumably the approach visibility is very reduced, limiting the ability to see the runway or sufficient cues for flaring, thus what is expected from 'a manual visual landing'.