Seems a bit of a daft move, the old emoji were made to deal with the fact that Windows has to deal with a much wider range of acceptable resolutions and DPIs than their competitors (apple's high DPI screens, google's focus on phones)

I don't think that premise has changed in such a short time, though I could be wrong.

Luckily this seems restricted to what is being done through online services, like other platforms which replace singular emoji with the equivalent stickers while still keeping a separate emoji font for when they are used as part of a message