This is how QuietMode is defined in the documentation:

True

User feedback is permitted. This value is default for a ReportListener object instantiated within an interactive Visual FoxPro session or in a distributable application (.app or .exe file). 

False

User feedback is not permitted. This value is default for a ReportListener object instantiated in an automation server. 

Check out the following sample:

PUBLIC loListener as rl in rltest.prg
loListener = CREATEOBJECT("rl")
loListener.PrintJobName = "My First Report"
m.loListener.QuietMode = .f. && .f. user feedback is permitted
                             && .t. user feedback is not permitted
m.loListener.AllowModalMessages = .t.
report form reports\rptbill1.frx object loListener

DEFINE CLASS rl as ReportListener 
	PROCEDURE BeforeReport()
		this.DoMessage(THIS.PrintJobName + " (runs " + THIS.CommandClauses.File + ")",0,"")
	ENDPROC
ENDDEFINE 

My conclusion is that it(QuietMode property of ReportListener) is documented incorrectly.