Bulk API-Activities: Not filtering ActivityTypeids

all,

I am trying to pull the activities data using bulk api, as a parameter I am supplying few activityTypeIds and expecting API should bring only those id's but what I am seeing it's bringing everything!   not sure what  I am doing wrong.   here the api request.   does anyone faced this issue?    how to solve this.  note : i do not want to use normal api call, must use bulk api.

headers = {'Authorization': 'Bearer ' + token}
params = {
    "activityTypeId": [1,2,3,6,7,8,9,10,11,12],
    "format": "CSV",
    "filter": {
        "createdAt": {
            "startAt": startAt,  # "2022-10-02T23:59:59-00:00",
            "endAt": endAt  # "2022-10-03T23:59:59-00:00"
        }
    }
}
resp = requests.post(host + '/bulk/v1/activities/export/create.json', headers=headers, json=params)