There are still plenty of ebikes listed that don't have that statement.
Notice how your example is part number 91622-5004
U. You can find the same bike -2023 L Tero X 4.0 in the same color- listed as a separate model with no U appended to its part number and the listing lacks the UL statement.
The shipping restriction popup was removed and the UL listings added at some point(s?) during 2024. I'm assuming they were able to back date UL listing for bikes that were built after certification started but before certification became official? I bet if you try to ship to home/store one of the non U models the site would stop you.
Confusingly, a 2022
Turbo Como is listed for sale as UL certified while the 2024 Creo 2 Expert is not. The Creo probably sold out so fast that there was no point.