Once you are done with the last step, you can no longer see the autocomplete list of formulas while typing in an Excel spreadsheet.

If Excel Autocomplete is not working, you have to check that Autocomplete is not disabled and that there are no Blank cells in the dataset.

I'm passingly familiar with autocomplete but have no idea what the 'autocomplete menu' is. Can you provide a screenshot or describe how you invoke it? I'm passingly familiar with autocomplete but ...