Deprecations don't work. Don't deprecate stuff without a really really good reason. The new API being cleaner is not a good reason. There are very few good reasons.

If you deprecate something in a popular library, you're forcing millions of people to do work. Waste time that could be used for something better, possibly at a time of your choice, not theirs. It was emitting warnings for 3 years... so you think everyone should have to rewrite their software every 3 years?

Especially for something like this. Only document it in a footnote, mark it as deprecated, etc - but don't remove the alias.

Don't break stuff, unless, to quote a famous work, you think your users are scum. Do you think your users are scum? Why do you hate your users?