At best we're left to assume that they're so disorganized that Mozilla has put out this article calling out a toxic practice they themselves are happy to continue participating in.
At worst we could look at this as Mozilla violating their user's privacy while also knowing that it's wrong and trying to trick Firefox users into thinking that Mozilla is looking out for the them and that Firefox wouldn't do the harmful things it's actually doing.
I very much wish Mozilla would either stand by the message in this article and disable the harmful defaults in their own browser or stop pretending to hold values they refuse to respect themselves.
In the end, the change being discussed in this article/advertisement is still a good thing for user's privacy and I get why they'd want to promote it as a feature of their browser often missing from others, but they could do that without the dishonest/contradictory messaging.