To be honest their entire report could be dismissed. Some things mentioned in that report:
Sun and Moon versions to Switch
Zelda to miss launch, coming later in the year
Mario is now a launch title
It's entirely off on everything
To play Devil's advocate:
- They reported on a single-game version of Sun/Moon coming to Switch, not a dual version
- Zelda potentially missing launch was sourced by a few different people. Due to the timing of that report it's very likely that plans changed
- Mario fed into the Zelda rumor above. It seems like the original plan was for Mario to be a backup launch game if Zelda wasn't ready.
I'm still in the camp that yesterday's Direct doesn't outright prove them wrong. It'd take Nintendo not announcing anything at E3 for me to question Eurogamer's sources on that one.
Before it gets said, I don't buy into the narrative that their source not mentioning 3DS games as a way to discredit their original report. IIRC, their reporting was exclusively about Switch.
Don't forget Mother 3 and GameCube VC.
This is a good "note-to-self" moment for the future. Nintendo/Game Freak/TPC as companies are very set-in-ways. If a "credible" leaker hypes up something that flies in the face of their normal modus operandi, regardless of whether they got something else right, don't fall for it.
I don't recall the Mother 3 and Gamecube VC rumors being proven false. We don't even have details on Switch's Virtual Console yet... Why do we feel the need to jump through hoops so we can start rumor-led witch hunts?