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The costmap is not automatically produced by the publication of a map, but rather by the configuration of your global_costmap.

What David Lu suggests in the linked answer is to use only a static layer (coming from the published map) which would create a costmap from the publish map, which is not what you want.

I have never done this before so I do not know how it would behave, but you could try edit your global_costmap.yaml to have a minimal config, without any layer, for example:

global_costmap:
  map_type: costmap
  global_frame    : map
  robot_base_frame: base_footprint

Again, I am not sure what the result will be, mostly because it depends on how your global planner plugin interacts with the global costmap.