The stall warner is to warn of the approach to a stall not for landing advice.
I don't entirely agree. Generally, in light aircraft, a well accomplished landing is a result of a well controlled near stall, just above the runway.
Therefore, if you get a stall warning just above the runway, I would say it is additional useful information about the progress of the landing.
Alternatively, for those aircraft types where a near stall condition at toughdown is inadviseable (Lake LA-4 during water landing, and some taildraggers, for example), a stall warning during the landing is probably an indication that immediate intervention is required. Good advice to be getting at that moment!
Either way, the stall warning is providing useful information for a good landing, if correctly interpreted.