Earlier quoted context omitted.
The author does not claim it isn't open source, the author claims it doesn't comply with the four freedoms. > and will need to recompile the source code to create your own binaries. I believe the author specifically calls out this document themselves, and emphasises the phrase above, as being the problematic portion. And while canonical does also say "For further information, please contact us (as set out below)", th…
Could this possibly refer to situations where the original binaries contain trademarked content?
The other, non-trademark-containing software, is distributed under a FOSS license (both the source and the binary derivative), and I don't see how anyone could be legally forced to rebuild the binary.
The copyright situation is clear, the legal leg this is standing on seems to be the trademark situation.