A famous Bitmex Whale is JOE007, you can find him on twitter.
someone who is really a "whale" is never going to give any kind of indication of being an actual whale unless they are braindead in which case they won't remain a whale for long or the most possible scenario is that they are scamming others which seems to be the case here.
that is no to mention that a whale doesn't waste their time on social media...
You can follow JOE007\s positions on Twitter, and I am sure if you see the amounts he is moving, you will not disagree that this is a whale.