Yes it is... it's in the PLURAL FORM of the verb ( basanisthēsontai "3rd person PLURAL )... which is ONE WORD in the Greek... not three, as I bolded in your post above.
OK, no problem. Let's go with that then.
That still addresses those three only. No one else is ever said to be tormented forever, right? You only assume, with no scriptural backing, that God would treat anyone else as severely despite tons of scriptures stating the opposite.
Then we have to deal with the possibility that "for ever" there isn't literal because God has used similar language for non-literal "for evers"
Plus, scripture promises the devil will be destroyed and not exist anymore so that supports Annihilation even for the Devil and if the Devil will be destroyed, then certainly the beast and FP would also be destroyed since they cannot exceed the wickedness of satan himself.
Lastly, in the eternity pain no longer exists which further rules out any possibility of people being in pain forever.
At best eternal torture has support for only the beast, FP and Devil to be tortured forever but even that ignores other scriptures mentioned already.
The case for Annihilation is immensely stronger and better supported.