"This mountain obviously has a lot of history... but I don't know if we have ever seen anything like today in a peloton," Armstrong said on
The Move podcast. "Riding away completely from two amazing riders, Reusser and Demi Vollering, 9 kilometers from the finish line. I place this among the great achievements. It was an incredible finale".
Armstrong ranks Niewiadoma's performance very highly, in a field that contained many of the world's best climbers chasing her.
"The peloton may have received a gift from EF for riding at this pace. What was EF doing? Who knows? I don't know!' But they narrowed it down to 10 riders, and after that it was simply 'the best woman wins'."
Demi Vollering was second on Mont Ventoux at the Tour de France Femmes
Armstrong questions Vollering's tactics
When Katarzyna Niewiadoma attacked Demi Vollering and Marlen Reusser, the American pundit had no doubt on what would happen.
"When she went and had a minute and ten seconds lead, I got up to go to the toilet and said 'she is going to win by two minutes now.' She was well on her way to doing that, but Demi still had that extra acceleration at the end, which is quite bizarre".
Vollering could not close the gap to Niewiadoma at first, trying to bridge across whilst dropping Marlen Reusser. That was plan, but execution was harder. In the end, the European Champion then waited until the final kilometer to attack again.
"'In my opinion, you shouldn't ride that hard at the end of the Ventoux. You need to keep a little in the tank, but you should have deployed most of it lower down the climb.," Armstrong believes.
"She flew at the end, she went so fast". The acceleration, whilst impressive, was not enough to shut down the gap in sufficient amount to jump into the yellow jersey. After Reusser, it was now Niewiadoma in the lead.
"Especially when those two (Reusser and Vollering, ed.) were looking at each other... at that moment they need to look at each other and say 'whatever the relationship was in the past or is now, let's put it aside'. Kasia is riding away from them and is on her way to the yellow jersey. So now, regardless of what has been said or happened, we need to find synergy and not let her ride too far ahead".
Armstrong questioned the long time waiting to attack Reusser towards the end of the climb, when it then proved to be very clear that Vollering had the legs to make the difference quite easily.
"The only question I have for Vollering: 'On TV it looked like she had a weaker moment halfway up the steep section where she didn't feel so good, and that she recovered from that? But yeah, it was way too much energy to have left at the finish to close the gap like that, while she looked so strong. What if she had attacked 2 kilometers earlier? Then she would have come very close".