They never will say those words. Are you familiar with "public relations"? Ion did say:
The comment was made on a Blizzard Live Q&A on April 26th, 2018.Originally Posted by Ion Hazzikostas
Which isn't a never, but as someone who understands PR very well, that's him saying "No." Blizzard won't allow him to say it more directly, so he answered the question in a very "human resources" way, AKA "letting them down softly". You can divine whatever you'd like from his statement because it isn't absolute and another Director could take over and change that. But he elaborated that there are currently no plans to add High Elves as a playable race to the Alliance. I, personally, take his statement as an absolute "No" in the face of a request that borders on futility and redundancy.
For PR reasons, companies RARELY say "never". That's common sense.
It's a plain statement that the pro-community has desperately tried to discern a shred of hope from. It's been a request for over a decade, they've answered. Some of us accept the reality, others clearly do not.