It's true, but the same does apply to all current performances, i.e Kipchoge, Bekele, Kosgei, Hassan, Jepkosgei.
The weather was perfect in Nijmegen, and he had a personal pacemaker until the 9th km, then she chased men but without being in their slipstream at any point.
I think she can run 30-40" faster at 15km on a very flat course and in the same weather conditions.
A 44'20" 15k is 2'57"33/km which is 1:02:22 HM pace. It's not absurd to think Gidey on a pancake flat course like Valencia or Berlin would be able to hold this pace for another 6km. Even on sunday, on the Zevenheuvelenloop course, if she had to run a half instead of a 15k, i believe she would have ran under 1:04, no doubt, and with more specific training, closer to 1:03 flat.
If she keeps this going, Gidey will break the HM world record whenever she decides to make her debut, even in bad weather. I would not be surprised if she decides to run a spring Half as strength preparations for her track season. RAK half/Lisbon/Prague/Berlin half would be the fastest, and i believe under the right conditions, she can slash more than 2 minutes from the current WR by Jepkosgei.
Remember the name folks, at this rate Letesenbet Gidey is on it's path to become the GOAT female distance runner. She can be the first woman to run a half at under 3:00/km pace and a marathon at under 5:00/mile pace.
Now she will be favourite in any event she takes part in the range of 5,000m - Half Marathon (which is crazy, assuming she is yet to make her debut). She will be very tough to beat in the 3,000m too, and very decent in 1500-mile. Hassan has to up her game if she wants to defeat Gidey again in 5,000-10,000, maybe so much she would need to be in WR shape to even have a real chance...
This being said, i expect another WR to go down very soon. Joshua Cheptegei, who is also a NN Running Team member, guided by Jurrie Van Der Velden and Addy Ruiter, also part of Jos Hermens' team. He will go for the road 10k WR in Valencia, and with the right weather conditions, he can run closer to 26:30.