Nobody knows.
Moreover, nobody talks about that because it's boring and non-polarizing. Instead, supposedly smart people post stupid comments that prevent anyone from understanding this paper is worthless.
The paper is worthless because it has a click-bait title. Blog posts get voted down for that, why not this?
The implicit claim is worthless. Failure to navigate a synthetic graph == failure to solve real world problems. False.
Absolutely no connection to real world examples. Just losing the model in endless graphs.