I think the marketing got mixed up between the first and second versions of the signature Fulk bats.
The 2019 (first D Fulk) was 12" end loaded APC in even oz weight sizes.
The 2020 (second D Fulk) was 13" mid load Nautalai issued in half oz weight sizes very similar to the red Nautalai.
The 2021 (third D Fulk) is also a Nautalai In half oz weight sizes.
Haven't swung the 2019, but the 2020 Fulk Nautalai is a great bat.