Why is SpreadSheetWriter deprecated?

Why is SpreadSheetWriter marked with @deprecated, despite being shown off in the README.md?
Is it truly being discontinued?

[millij]

Currently, the SpreadSheetWriter supports only xssf, i.e., xlsx writing.
Plan was to rewrite the SpreadSheetWriter into dedicated writers for xls and xlsx, similar to their respective readers. Hence the deprecation.

Is it truly being discontinued?

As explained above, the current SpreadSheetWriter implementation will be renamed to XlsxWriter.

Thank you for clarifying.