This really makes it more of a propaganda weapon than a free speech platform.
That's what the OP was referring to. If everyone is going to call out Parler for being a propaganda channel, then apply the same standards to Democratic Underground, r/politics, r/antifa, etc.
But sure call it propaganda if you wish. Perhaps it is. Many anarchists such as my self are well aware of the propaganda we proactively distribute on a daily basis.
What the ancestor is complaining about is that when the right wing does propaganda, it is not called propaganda, it is called free speech.