I would interpret it as implying that the result was due to a lot more hand-holding that what is let on.

Was the initial conjecture based on leading info from the other authors or was it simply the authors presenting all information and asking for a conjecture?

Did the authors know that there was a simpler means of expressing the conjecture and lead GPT to its conclusion, or did it spontaneously do so on its own after seeing the hand-written expressions.

These aren't my personal views, but there is some handwaving about the process in such a way that reads as if this was all spontaneous involvement on GPTs end.

But regardless, a result is a result so I'm content with it.