Can magnetic sensors be modeled and simulated in PLECS? As shown below, you can set the parameters to build a model and run the simulation. Infineon - Magnetic Design Tool: Angle Sensors
Yes, the effort is to figure out a way to model such a relationship via equations, transfer functions, etc. such that the desired physical behaviors are represented. What exactly are you trying to model?
The link you provided doesn’t look so much like a time domain simulation but a relationship between various design variables providing a relationship between 1. air-gap distance and flux and 2. magnetic diameter and error. A quick review of the documentation provided doesn’t share the exact formulas used to calculate this data. You can always export this data and encode it in a look-up table or fit it using an appropriate function, for example if your air-gap width varies as a function of position.