Interesting that someone who is also interested in staying at the world's most expensive hotels (Burj, etc.), in just about any place he can think of, is also concerned about the nickels and dimes of taxes. I probably used to do the same thing when I was a schoolboy and daydreaming about traveling all over the world, so it's undoubtedly harmless, sort of like a pebble in a shoe.
Of course, had the OP taken the time to read the web site page to which he referred, the OP would have seen that "Fares are ... exclusive of any taxes and passenger fees."