These potential anachronisms are easy to insert when retelling a story. It doesn't really mean he "made it up", but reverse engineering how the diagnostic was determined might lead one to use tools/definitions that didn't exist at the time.

It's also entirely plausible that a local definitions file was used to provide the unit that didn't come in the default install. Hence the anachronism is merely "potential" instead of "definite"

I don't think that's enough evidence to claim he made the whole story up.