This is usually true -and not necessarily in the same season- if a faster than PB but windy time is achieved (e.g., a 9.6x), which can also be run later on under legal conditions. The excellent 9.72 is not a new territory for Asafa though. Of course, this doesn’t mean he can’t produce a 9.6x (I hope so!)
As for technique, I think the less consistent it is, the more the chances it will break under pressure (remains to be seen).