Supermint-3 License change consideration

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I noticed that Supermint 3 is listed in the theme store as free and stored on Github by the original maintainer athttps://github.com/myconcretelab/theme_supermint.... The Github LICENSE file refers to the concrete5 standard "Commercial Add on License"

There are two forks of that repository on Github, one with some upgrades by MichaelMaar and a fork with merges of those changes by NorthDecoder.

It appears the original maintainer is no longer contactable through their website or other means to find out if they would be willing to consider a change in license.

Would management at concrete5 be willing to change to the open source license?