They know about it and when their system admins get in it will be corrected. It's interesting because all of their other sites (e.g. https://he.net) has a wild card that is valid till 2021.

On Wed, Feb 26, 2020 at 10:44 AM Steve Jones <thatoneguysteve@gmail.com> wrote:

The *.he.net cert expired today so the looking glass is inaccessible from chrome if anyone here has a contact to rectify