Eiffel 65 had a substantial break but never officially disbanded. What happened is that after the worldwide peak of "Blue" around 2000, the band started to splinter: Maurizio Lobina and Jeffrey Jey continued with different projects, while Massimo Gabutti gradually stepped away. The dynamic was more of a gradual dissolution than an official breakup announcement, which created confusion about what was actually happening to the group.
The important thing to know is that they were never completely inactive. They did sporadic reunions and concerts here and there over the years, especially for summer festivals or nostalgic 2000s events. In recent years they've also made some appearances together, so if you want to catch them live, it's worth keeping an eye on tour announcements and summer dates, where they pop up pretty often.
If you think they've disappeared forever because you don't hear about them in current media, that's the real trap: they're no longer riding the wave of mainstream music, so they have less visibility. But that doesn't mean they're not doing anything anymore. It's worth checking their social media channels if you're curious to re-listen to the original tracks or find out what they're up to these days.