The "optimism" belonged to the same person who was also highly optimistic that Skopje would vote for his name...

The "optimism" belonged to the same person who was also highly optimistic that Skopje would vote for his name agreement in the Referendum...so Zaev's second "optimism " of his may not be worth paying attention to

Read the first paragraph of this article, which states:

"FYROM’s parliamentary speaker, Zoran Zaev is optimistic that the necessary votes will be secured in order to vote the constitutional amendments for the Prespa agreement and put an end to the solution of the name dispute."
http://goo.gl/alerts/QPQ89