Yes, we provide extended support for end-of-life devices which had less than 5 years of proper support. We provide that for at least 1 year and no more than 2 years. However, unlike other alternate operating systems, we're completely honest about the insecurity and do not downplay it. We do not falsely claim to provide all open source patches and do not set an inaccurate Android security patch level. We try to strongly discourage using the extended support releases. We plan to add a notification about this to the OS which people can disable instead of only clearly marking it as insecure on the site.
So they support it even a bit longer than google officially does.