They're not model parameters as far as I can see on the screenshot. https://pro.arcgis.com/en/pro-app/help/analysis/geoprocessing/modelbuilder/model-parameters.htm You want to publish a geoprocessing tool (task) onto ArcGIS Server with hardcoded parameters? I guess that's possible, and I'm sure there are some use-cases for it, but I don't understand this workflow's purpose. If you want the tool to publish successfully you would also have to ensure the folder/parent directory is registered in the ArcGIS Server data store (do this in ArcGIS Server manager). I'm guessing that you actually want to have the user specify an input table - so add the input as a parameter, and also the output. Then run the tool, ensuring that it is saved in a location registered to the data store, and that the data store has access to the input table/xls. On publishing, Arc will wrangle the input and output for use as a GP tool/task.
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