How can he do that?

[Alblaka]

I was saying: where does he go to rate the post (I know that he can't rate) because there is not any rating button!

You don't get it: Bots do not see this forum like your browser displays it.
They don't click links, don't use buttons, they just access any possible site directly.
there is no rating button anymore and rating is disabled, still there is some sort of reference to the rating function somewhere. A bot found it, followed it and you made a screen of the bot's status while it was scanning the thread-rating-page. Or stuff.