Nice find but that’s not enough for me to go on. The Flint v1, Slate AX are also Qualcomm SBCs (IPQ6000, quad core, 1.2GHz v IPQ4018, quad, 717MHz).
I wonder if it’s a matter of the “QCA binary drivers” licensing… but I may be going a touch off topic here. I’ll wait for @solidus1983 to chime in with his perspective.