As long as your flight numbers across the Pacific are ANA flight numbers operated by ANA and NOT UA, or are UA flight numbers that ARE operated by ANA and NOT by United, then you will be able to enjoy ANA F both ways at that price. It comes up for me just fine with ANA flight numbers for flights operated by ANA across the Pacific both ways.

If you're unsure, then make sure you're booking an ANA coded flight across the pacific, and make sure the flight numbers are one digit, two digits, or a four digit number starting with 10, i.e. 10XX flight numbers. Anything else means the flight is operated by UA, for this specific scenario. If you're still unsure, then consult a human travel agent with specific instructions to book the ANA operated flights, and a human TA would certainly be glad to help you get these flights at the ~$7000 price.