Exclude events with venue identifier "online" from being displayed in the EE4 calendar

exclude_venue_calendar.php

<?php
//* Please do NOT include the opening php tag, except of course if you're starting with a blank file

add_filter(
  'FHEE__EED_Espresso_Calendar__get_calendar_events__query_params',
  'my_exclude_online_venue_calendar_filter',
  10,
  7
);

function my_exclude_online_venue_calendar_filter(
  $query_params,
  $category_id_or_slug,
  $venue_id_or_slug,
  $public_event_stati,
  $start_date,
  $end_date,
  $show_expired
) {
  // get all venues
  $venues = array();
  $venues = EEM_Venue::instance()->get_all();
  // create loop to insert IDs to array
  foreach( $venues as $venue ) {
    if (!$venue instanceof EE_Venue) {
        continue;
    }
     // exclude venue 'online' only!
    if ($venue->get('VNU_identifier') != 'online') {
      $venue_ids[] = $venue->id();
    }
  }
  $query_params[0]['OR*venue'] = array(
    'Event.Venue.VNU_ID' => array( 'in', $venue_ids ),
  );
  return $query_params;
}