In an attempt to reproduce your problem, I installed the "System Info" portion of Symantec Corporation's Norton Utilities bundle version 3.1.1, onto a Power Macintosh 8100/100. When I ran the tests, the report said that the CPU is a "PowerPC 601 @ 100 MHz", and that "all the tests were run in native PowerPC code."
You didn't specify the actual version number of the Norton Utilities software that you have. One way to tell if you have this version of the software is to check your original Norton Utilities disks. There should be a document named "Norton 3.1.1 ReadMe" on one of these disks.
If you have version 3.1 rather than 3.1.1, I would recommend that you upgrade to version 3.1.1 and run the SYSINFO utility again. You should then receive the correct and expected results.
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Article 17159: "
Locating Vendor Information"