Can’t find information on Event Handlers associated with FileReader interface on MDN docs, why?

Based on past questions about FileReader event handlers (like this one), it appears that MDN docs used to include information on event handlers like FileReader.onload and FileReader.onloadend, but they no longer do.

I did find some information on the UDN web docs site (a site that collects archives of older MDN content).

Yet the MDN docs do not list these event handlers as ‘deprecated’.

FileReader.onload still works, but I can’t find information about it in the official documentation.

Why?