The warning only applies to the oxygenated compound. If there is an ILR present, there is no lower limit to what can be identified. Gary is right that using just extracted ion chromatograms or extracted ion profiles to make an identification is dicey. If the total ion chromatogram does not look like an ILR, one needs to be very cautious when interpreting extracted ions.

Ray Keto of the ATF lab published a very useful article in 1995 that is still very relevant today. Keto, R. O., "GC/MS Data Interpretation for Petroleum Distillate Identification in Contaminated Arson Debris," Journal of Forensic Sciences, JFSCA, Vol. 40, No. 3, May 1995, pp. 412-423. He states that just using EIPs may result in making an identification of an ILR that is erroneous.

I'm happy to provide a copy to anyone who asks. Email me at scientific.fire@yahoo.com