Okay, if you're seriously interested in being civil and constructive you need to get over the conspiracy mindset. There's no such thing happening here or elsewhere. Now, if we can get past that and you are willing to have a discussion on good faith we can continue.
Let's try to break down the whole picture here, back to when the episode aired, starting with the links you provided. First two links - nothing. Third link, you see a segment off lyrics with "I'll defeat his ass!" What you are most likely seeing is a cached (archived basically) description of the article; this is not the actual article text. The incorrect URL below the text also supports this. Fandom's search feature is one of the worst features they've developed which is a great reason to use a search engine for anything more than an article title.
A song's lyrics are typically written by one of the most active editors here and in the fandom and then compared to fans that frequently make lyric videos. When the article was created, the lyric was believed to be "I defeated them." Some fans believed it was "I'll defeat his ass!" so they included it in their videos, even asking Nick about it. Back then Nick was releasing lyric videos of songs and this song was released by them, containing the current lyric - "I'm defeating them!" This lead to a new fan review of the song and some began questioning whether Simon even swore, which didn't seem likely to start with. Nick's video wasn't entirely accurate (the first I believe, I think they later deleted it), but Simon's final line seemed correct, backed up by fans slowing down the song. While Nick isn't the best/original source for lyrics, they do provide some backing for the current lyrics. We may never find out what the official lyrics are and may be left with fan speculation.
I originally believed Simon swore when I first heard it (my TV in my living room doesn't provide as HD sound as my computer speakers). As I looked into the song more, the current lyrics, supported by Nick, were finally heard (as I told you before, sometimes lyrics to songs suddenly become clear - can be any song). I haven't heard him swore in any of my listens of the song since. That being said, no one's hearing is an objective source.
The current lyrics are there for three primary reasons: multiple active fans believe it's correct, the likelihood Simon swore in the series is very low, and Nick's video.
Additional discussion from other active fans can be found on the article's talk page.