It seems to me like they write some things that are obviously satire, and some things that a reasonable person would have a hard time differentiating from non-satire. This is what I'd expect a propaganda outlet utilizing the strategy I described to do.

Of course, we're not the first ones to be having this conversation. Here's Snopes themselves commenting on the phenomenon: https://www.snopes.com/news/2019/08/16/readers-think-satire-...

and here it is being described in the mass media: https://www.nytimes.com/2019/08/03/us/snopes-babylon-bee.htm...