It's not going to destroy anybody but I'd reckon that Cansiglio refers to Passo Della Crosetta which, assuming they take it from the Sarone side, is a fair obstacle in comparison to Sella Fadalto, 15.5k at 7%
Yes, I didn't notice that one, but that side of the ascent is on the Via Cansiglio. Still, a good climb after less than 30kms, that could lead to a strong breakaway.
Also, you can surprise people by drilling the short, steep descent after Venas di Cadore that leads right into Passo Cibiana and hitting the first ramp at the start of the climb hard, if anyone high up on the gc is caught behind he can loose a lot of time.
The Corriere delle Alpi is the biggest local newspaper in the province of Belluno and usually reliable when it comes to stages that finish or start in their province, so I trust them on this one and their detailed stage description.