Of course this is false; please consider:

- customers expect to see in search results whatever new information they added/updated in the system (this is related to "Customers don’t expect near real time updates");

- customers expect "personalized" search results; having built up a history of searches centered around particular subjects (say, programming), you'll expect much different results for "string" than the general population gets;

- customers expect new/more results having logged in, or having gained new permissions/roles;

- customers running "knowledge" or "command" queries ("what is the weather?" "password 16") expect varying results