Timing reports from Warp are guaranteed as worst case delay.
For 37K and older (non 38K / 39K designs) the simulator is very accurate based on the physical data from the programmed devices. For 38K and 39k designs are less accurate, but still within 0.1ns.
Please be noted our entire Cypress CPLD product are Obsolete and not recommended for new design and development. Also our Warp Software Tool is Obsolete.