How to remove filter added by another plugin in a class

Ok I’m struggling here – I feel this should be straightforward but I’m just not able to get it to work.

I need to remove a filter added by Woocommerce Subscriptions. The filter is part of the WC_Subscriptions_Switcher class found in class-wc-subscriptions-switcher.php and is added as below

class WC_Subscriptions_Switcher {

/**
* Bootstraps the class and hooks required actions & filters.
*
* @since 1.4
*/
public static function init() {

// Display/indicate whether a cart switch item is a upgrade/downgrade/crossgrade
add_filter( ‘woocommerce_cart_item_subtotal’, __CLASS__ . ‘::add_cart_item_switch_direction’, 10, 3 );

The function adds text to the cart (either (Upgrade), (Downgrade) or (Crossgrade) which I don’t want/need to be displayed in my case.

I have tried simply using the remove filter function as below from the WordPress Codex however the text in question is still displayed regardless.

global $WC_Subscriptions_Switcher;
remove_filter( ‘woocommerce_cart_item_subtotal’, array($WC_Subscriptions_Switcher, ‘add_cart_item_switch_direction’) );

I have also tried everything (I think) I found at the below answer and also simply tried the below from the
remove_action or remove_filter with external classes?

How do I remove this filter so that it’s not fired in the first place? I know I could override the text using gettext but I think it’s cleaner to not have it run in the first place (and even using gettext the html tags added by the filter will remain).

Any help appreciated.

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