Outernet GPL violation

I think that Outernet is violating the GPL of librtlsdr and libmirisdr by releasing
some of their software under a closed source licence.

Here you can see some of the Outernet software:

https://github.com/Outernet-Project/outernet-linux-lband3

The file bin/sdr100-1.0.4 is provided in binary form only under a
closed-source licence. However, this binary links to librtlsdr and
libmirisdr through some wrapper called StarSDR. StarSDR is licenced
under the LGPLv3.

I am not a layer, but I believe that since StarSDR links to librtlsdr
and libmirisdr, which are GPLv2 or later, then the combination is
covered under the GPLv3. See the table in
https://www.gnu.org/licenses/gpl-faq.html#AllCompatibility

Therefore, sdr100-1.0.4 should be released under a GPLv3-compatible licence.

I think that the argument that the wrapper StarSDR is LGPL and so
sdr100-1.0.4 can be released under closed-source terms because it only
links StarSDR directly does not work. It's very easy to write an LGPL
wrapper for a GPL library, so if this sort of trick worked, then it would
be pointless to licence libraries under the GPL (and not LGPL).

Can someone with legal experience give advice on whether my interpretation is correct?
Please contact me at <daniel_AT_destevez.net>