Hmmm....good question. I used it to check my commute for this week, and it showed a tax.

Status was "Personal," not vacation or family vacation.

I had looked under one of the FAQ pages, and it said

"ALL pass riders must pay applicable taxes and fees."

Now, I had interpreted that to mean imputed tax for all, but the note you mentioned seems to make the above mean AIRPORT taxes and fees.

Still learning....