vilas: "if an airline doesn't impart the required training for 4secs/1000ft to touchdown but their performance is calculated on that, if an overrun occurs will it be blamed for faulty performance parameters?"
We should not infer blame - a judgement after the event.
Instead consider beforehand; if the regulator has given permission to use 1000ft, then who checks its use and the achieved landing performance; safety margin - SMS, Flight Data Monitoring.
Of course if the regulator accepts the advisory interpretation, placing responsibility on the operator, then the risk of overruns could be higher,… but who would know.
A safety weakness in advisory 'regulation' and monitoring of that.
BB, but even for dispatch the critical parameter is the overall landing distance.
Whilst some authorities still allow operators to use generic data before flight (1000ft), all operators (either by requirement of advice) are required to check that the landing will be safe based the Factored Operational Landing Distances (≈1500ft) - as apparently you do.
However, if pilots invoke 1000ft flare before landing, is this by regulation or advice; and in either case this should be trained-for, checked, etc, as per vilas.