They know they can't just outright call them racists. That's a concrete accusation, which opens it up to evidence and countering with reality. Probably also libelous.
By saying its just been infiltrated by racists, it preempts any questions by saying its super secretive so they can't prove it directly but its still there and even more insidious because its manipulating them behind the scenes. Now every little misstep is proof of the larger conspiracy.
How exactly does one become "infiltrated by racists"?
If anything, Canada's conservative party seems to be infiltrated by communists, because communism is all they've been conserving.
They know they can't just outright call them racists. That's a concrete accusation, which opens it up to evidence and countering with reality. Probably also libelous.
By saying its just been infiltrated by racists, it preempts any questions by saying its super secretive so they can't prove it directly but its still there and even more insidious because its manipulating them behind the scenes. Now every little misstep is proof of the larger conspiracy.