How to get rid of WW8Num8 list style [closed]

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Here is a clear outline of why this is happening and explicit steps on how to remove the unwanted list styles. The question is related to this one, which explains that the MS Binary (DOC) and OOXML (DOCX) file formats do not support list styles e.g.,

These styles are the results of a .doc opening.

This is a rough outline of the steps required to remove these styles:

1. File > Save As... > select format of "ODF Text Document (.odt)" > click OK. This is necessary, otherwise these styles will keep coming back, because they are the result of ODF list styles being converted in the output filter.
2. Close / re-open document (the newly saved ODT, not the DOC).

3. Re-style all list text instances:

   1. If a custom list style definition is to be used, it is first necessary to define the required list style e.g., List 1 start at X (based on List 1 list style).
   2. Re-associate paragraph styles to list styles. In the Styles and Formatting panel > right-click on the required List N or Numbering N paragraph style > Modify... > Outline & Numbering tab > Numbering section > select the required Numbering Style (e.g., Numbering 1). Refer the answer here as to why this association between paragraph and list styles is important, especially for those wanting to make use of styles (rather than use direct formatting).
   3. Repeat step (3.1) for each required custom list style and step (3.2) for each paragraph style of a list type that is required to be used.
   4. Associate each instance of a list (and the list items, as required, refer this answer) with the appropriate paragraph style (not list style).

4. Remove WWNumN list styles. As you indicate in the question, this can be done via right-click on the WWNumN list style > Delete.... If any of these styles are still in use, a dialog will display indicating this (after step (3) above these styles should not be used).

5. Save the re-styled document (to ODT). Any re-save to a non-native format will undo all the above work.