Actually Papa Roach already been to Sziget in the past.. so that's not impossible, that would only mean they might try to bring more of this kind of acts , just like in the past ^^ (the good ol' days... 🙂 )
Having lost any confidence in this happening at Glastonbury, it's worth pointing out that they didn't have a "UK Festival exclusive" tag in 2023 or 2024 either and still didn't turn up. Even when the Festival needed to find a replacement headliner relatively late in the day.
Really don't think that it's possible to read much into this.