I don’t want to be that guy, but that particular Tyrande comment* was in reply to someone specifically talking about being unable to obtain Tyrande because the promotion wasn’t available in their country. Which means it’s possible that Tyrande will be available by the end of the year… for players in countries where she wasn’t available before.
*Link: Rise of Shadows Q&A - April 22, 2019 - #299 by MeanBob-1146