What I think you are saying is:
The police are arguing both sides (in typical fashion). On one side, the police say that GrapheneOS is for criminals because of its privacy, etc. However the police are also trying to convince people that GrapheneOS is not private or secure, in an attempt to sway people from using it.
[1] https://grapheneos.social/@GrapheneOS/114784488424006190 and so forth.
My guess is the ambiguous use of "they", interpreting "they" as GrapheneOS instead of the police.
That makes it seem like you are criticizing GrapheneOS rather than the police.