Policies always change within the councils..... do you know for sure this hasnt happened since you had you preplanning meeting...??
To be honest ive found pre planning meetings to be a waste of time 90% of the time.. all they do is reiterate the county development plan....
in your particular situation it may have been the planners opinion that 65 m was sufficient, yet the 135 m sightline may be a requirement coming from a road design engineer...... therefore the planner is in the clear...
do you have minutes of this meeting??? was it all word of mouth???
are you able to tell us why 135 m of sightline has been asked for???
your agent may be able to get the sightlines to comply with NRA guidelines,....then if the council refuse permission, the the Bord is always an option, however traffic safety is an easily provable issue, and if you cannot confrom to safe sightlines then the site is not suitable for a house, as straighforward as that unfortunately.......