Nesting Task.Supervisor.async_stream bad idea?

So im looking to do something like below where I get a list of posts from the db and then run an api call on each post's comments and i want it to all happen as concurrently as possible. Is nesting task bad practice?

defmodule MyApp.ObanWorker do
  def perform do
    posts = MyApp.Repo.all(Posts)

    MyTaskSupervisor
    |> Task.Supervisor.async_stream(posts, &MyApp.ApiClient.do_it/1)
    |> List.flatten()
    |> Enum.each(fn {_, message} -> Logger.info(message) end)

    :ok
  end
end

defmodule MyApp.ApiClient do
  def do_it(%{comments: comments} = post) do
    MyTaskSupervisor
    |> Task.Supervisor.async_stream(comments, &make_call/1)
    |> Enum.filter(&(elem(&1, 0) == :error))
    
  end

  def make_call(comment) do
    result = # ...make api request
    
    case result do
      {:ok, %{status: 200}} -> {:ok, "good job."}
      _ -> {:error, "not good for #{comment}."}
    end
  end
end