Sure it does, but that doesn’t make it bad.
Open source code is not the only solution to secure communication.
You can be extremely secure on closed source tools as well.
If they found specific issues with Signal aside from not being allowed to freely inspect their code base, I suspect we would be hearing about it. Instead I don’t see specific security failings just hat it didn’t make the measure for their security software audit.
As an example of something that is closed source and trusted:
The software used to load data and debug the F-35 fighter jet.
Pretty big problem for 16 countries if that isn’t secure… closed source. So much s you can’t even run tests against the device for loading data to the jet live. It’s a problem to sort out, but it’s an example of where highly important communication protocols are not open source and trusted by the governments of many countries.
If their particular standard here was open source, ok, but they didn’t do anything to assure the version they inspected would be the only version used. In fact every release from that basement pair of programmers could inadvertently have a flaw in it, which this committee would not be reviewing in the code base for its members of parliament.
Most modern cancer drug treatment is sequenced to at least the specific proteins of the type of cancer it is.
Have breast cancer? Cool. We figure out which of the many variations so that we can give you medications for that exact type of breast cancer.
This sort of specific targeting has been increasing and increasing for the last 20 years. MRNA is the next step of that and is highly likely to be a means or become or for treatments in many other areas.