The "PowerBook 1400 Demo" is merely an interactive presentation to show the features of the 1400. It is not intended to be a diagnostic tool or system profiler. Most likely, the presentation was written before the 133 mHz processors were part of the 1400 product line.
To confirm the speed of your processor, you may run Apple System Profiler, available with Mac OS 7.6 or online at Apple Software Update sites.
These articles can help you locate the software update mentioned here:
"
Where To Find Apple Software Updates" - Lists online services for free Apple software updates.
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Obtaining Apple Product Support in the USA" - Lists 800 numbers and online services for software updates, Apple support information, and a subset of the Apple Tech Info Library.