From the filtering logic point of view you have also to select “in stock” checkbox and you will not see this product because it doesn’t match to both these parameters simultaneously (size + stock status).
But you optionally can use link with predefined “in stock” filtering criteria to your product page. For example your current product page is https://example.com/shop/ you can place somewhere in menu https://example.com/shop/status-instock/ and if users will open the page, they will see only in stock products or variable products that have at least one in stock variation.
Optionally you can sort you products so out of stock products by default will be in the end of products list. You can try to find code example in Google.
In couple weeks I will add the Sorting field to my plugin so there will be opportunity to sort products by stock status also.