"Syrio is Not Necessarily Dead"

[The Anti-Targ]

That's a direct quote burned into my memory from meeting a certain actor who shall remain namelss at a pop culture expo I met him at yesterday.

What does this mean?

That is line the producers told said actor to say whenever he was asked a question about Syrio in the TV series?

That Syrio will return, but not as we know him?

That he has no idea but he knows many fans want to believe he's not dead so he's stringing them along?

It could be full of meaning, or it could mean nothing.