how does Slags ability work? How does Slag interact with Learjet?

Is that an erratum?

Clarification so will update card text in kot pod

Ankha wrote:

Read Slag as "Camarilla: While Slag is ready, any Methuselah playing or discarding a card in a referendum shows you its replacement."
So it works for each card played in that time period.

For the sake of tournament rules: is this a clarification or a ruling due to unclear card text (effective immideatly)?

or a erratum for "wrong" card text, since its "read as" (30 day period till tournament relevant)?