We now have initSiteStats.php running on all wikis on 1st and 15th of each month (T59788), which means we no longer need to run updateArticleCount.php (T68867: Made it run on the 28th of each month on a subset of wikis).
initSiteStats.php recounts all statistics, including article count. updateArticleCount.php only recounts the article count. So these are redundant.
The removal of this cron should happen not before 15th April, so that we have seen at least one good run of initSiteStats.php before removing updateArticleCount.php (to not end up in a state where the one is reverted and the other is already deleted).