As long as emojis are used as an _addition_ to text labels I think this is a good thing. The problem arises when they are used _instead_ of labels, although that’s a problem that predates emojis, it’s common with normal icons. If you design an interface when some actions are only behind icons/emojis (no text, no hover title), expect users like me to click on them just to see what they do.
Yeah just as an adddion to the main groupings it's not terrible. The actual emojis used are not very good. It's unclear to me what several of them are or why they represent the group title.