That really depends on your definition of "supported". It does not form part of the base distribution, nor was there ever any paid support for it. A Debian de

That really depends on your definition of "supported". It does not form part of the base distribution, nor was there ever any paid support for it. A Debian developer built a deb package for it and added it to the "main" repository. Everything under "main" is normally considered to be part of the distribution. As you can see from the link I provided, the package was maintained for several years and received several updates until it was dropped for Stretch. That is exactly what I would expect from a supported package in Debian.