Moving the data on the product page

I’d like to move this down the page a bit on my product page. I’ve identified this is the line that adds the discounts to the page, but I can’t figure out how to change this via my functions.php. The array($this, ...) is throwing me off, I don’t know what $this means.

add_action("woocommerce_single_product_summary", array($this, "single_product_summary"), 45);

https://wordpress.org/plugins/woocommerce-bulk-discount/