A user-provided argument could also be an input parameter or a regular function parameter altogether. Yes, hyperparameters are often set by the user of a model

A user-provided argument could also be an input parameter or a regular function parameter altogether. Yes, hyperparameters are often set by the user of a model, but more specifically they are parameters that exist separately from the data put into a model (input parameters) or the structure inside of neural networks (hidden parameters). Hyper- meaning above, helps conceptualize these parameters as existing outside the model.