UPDATE: OK I figured it out with some tweaks on the code snipped posted by a user here: https://www.ads-software.com/support/topic/incorrect-number-of-wordpress-followers/
In case anyone else is interested, the following works but you’ll have to subtract out or disconnect the other subscribers connected via Publicize (twitter, tumblr, etc.)
<?php
$subs_count = get_transient('wpcom_subscribers_total');
if (FALSE === $subs_count || 'failed' == $subs_count['status']) {
Jetpack:: load_xml_rpc_client();
$xml = new Jetpack_IXR_Client(array('user_id' => JETPACK_MASTER_USER,));
$xml->query('jetpack.fetchSubscriberCount');
if ($xml->isError()) { // error
$subs_count = array(
'status' => 'failed',
'code' => $xml->getErrorCode(),
'message' => $xml->getErrorMessage(),
'value'=>(isset($subs_count['value']))?$subs_count['value'] : 0,
);
} else {
$subs_count = array(
'status' => 'success',
'value' => $xml->getResponse(),
);
}
set_transient('wpcom_subscribers_total', $subs_count, 3600); // cache
}
echo $subs_count[value];?>