From the PDF::Table module docs:

If the 'min_w' parameter is used for 'col_props', have in mind that it can be overwritten by the calculated minimum cell width if the userdefined value is less that calculated.

By setting 'min_w' to 0, it will be overwritten by the calculated minimum cell width, isn't this equivalent with autofit?

I tested with the sample script from the module's source distribution an it looks like it's working...