We have had a string of posts concerning this topic. The question was first posted by one of our Certifier's as we don't validate every course where there is a record set. Yes, this is true because of several factors.
B. Expert Manpower
If a record is set and it's not an open record then it's up to the Validation Chair to determine if remeasurement is necessary. Here are some of the factors used in deciding when not to do a remeasurement as expressed by Neville Wood our Validations Chair.
A. The measurer has a high reputation
B. A very similar course has been validated previously and the differences check out well by using some other source such as "Streets"
C. The record performance and that from other race particpants is that expected from those in other races.
Rule 265-3 states that all courses our remeasured. This is not what's done and must be changed.