Is it not there in the associated project file?
A search thru entire project yields no other references or the API
Dowlnload the project and see if you can find it.
I only found a reference in the .pdf-file only. Probably a leftover from an outdated version.
The code snippet in the AN explains how we use the two APIs provided by the component to obtain thermocouple temperature (explains the five steps of thermocouple temperature measuerement given in page 4 using the component APIs).
Find HotJnmVolt() API is not used anywhere in the code. In the code snippet, it serves to explain the five steps of thermocouple temperature measurement easily.