Sort of. The announcement is obviously silly, and April-Fools-y, but the changes in nginx aren't--what it's really about is Unicode in general, not emojis specifically.
The emoji craze has had the nice side-effect of forcing a lot of projects to make sure their stuff supports Unicode properly, because now it's something that even English-speaking software users can appreciate. It's a good thing.
More and more programs supports unicode now. Why stop at Emoji? APL is going to take back the world finally. Anybody still writing a multi-letter identifier in your code? So 80's...
