Cannot remove user events in Retail API

[pichit]

I've imported user events for testing but I want to clear all user events and re-import new user events for another testing. I've followed the instruction to remove user events (Link). After waiting for 24hrs, operation status is completed.

This is a POST request to delete user events between 2023-03-01 to 2023-03-07

RESPONSE=$(curl -X POST \
  -H "Authorization: Bearer "${ACCESS_TOKEN}"" \
  -H "Content-Type: application/json; charset=utf-8" \
  --data '{
  	"filter":"eventTime > \"2023-03-01T00:00:01.511Z\" eventTime < \"2023-03-07T00:00:01.511Z\"",
  }' \
  "https://retail.googleapis.com/v2/projects/${PROJECT_ID}/locations/global/catalogs/default_catalog/userEvents:purge"
)
echo $RESPONSE

This is a response of operation status

{
  "name": "projects/{PROJECT_ID}/locations/global/catalogs/default_catalog/operations/purge-user-events-XXXXXXXXXX",
  "done": true,
  "response": {
    "@type": "type.googleapis.com/google.cloud.retail.v2.PurgeUserEventsResponse",
    "purgedEventsCount": "6"
  }
}

I expect to see 0 events from Retail console in GCP but the number of events ingested still existed (nothing changed)

How can I remove user events under same project without deleting the entire project?