Huh, I hadn’t read it. Everyone I know / knew who identified as bi in the 00s or 10s explained it to me as I said, and that does seem to be the general public understanding of the term by anyone Ive talked to in person in the last 5 years or so.
Ive also had self professed pan people explain bisexuality to me as I originally described it as recently as 2 years ago.