I was not under the impression that Parler was shut down by the government, but more by the "cancel crowd". Was it a government operation ?
As for the article, it seems the main arguments are that :
- Signal was financed by Radio Free Asia (US government propaganda operation), at least 3 million.
- If the crypto was effectively unbreakable, it would not be recommended by big companies like FB, Google, etc...
It's interesting and it's always good to be a bit paranoid, but the evidence is a bit thin for me.