It probably aired on a local channel, just like Kim Possible.I've noticed that Disney+ is now carrying a Slovak dub of the 2012 animated series Ultimate Spider-Man. I honestly have no idea as to where exactly this mysterious dub came from, especially since Disney Channel CE (which did air the Czech and Hungarian dubs of this series) has never specifically had a Slovak audio track to begin with (instead exclusively airing in Czech in Slovakia), and I haven't been able to find any information regarding the Slovak dub outside of Disney+.
Perhaps this dub is actually original to Disney+?