@danmoyle exactly. However, the filters are independent of each other, so they are valid for any subscription, any product and any invoice.
This may or may not apply to the respective product. The contact may have paid for product A, but not for product B. The filter would still apply to the unpaid product B.
My expectation was something like this: you can reference a line item of a subscription in the subscription filter. I tried to illustrate the filter:
Filter contacts by active product subscription