No, she doesn’t say that. After the question, "what element do you dream to do?" there are two inserts in the footage with Rubtsova's words:
"Пятерной" ("Quints")
"Уже на удочке прыгали" ("This has already been done with harness")
There is no definite indication that this is "we jumped quints with harness". I'm pretty sure that she said about Belyavtsev’s attempt.
The subtleties of the Russian language, the power of the editor ...
Rubtsova, though soft spoken, is a force to be reckoned with when it comes to presenting an image through artistry, this for me is one of the stand out performances from this year's Ice Age, Kids:
https://www.youtube.com/watch?v=PwhWZQcd9Tk, making TAT almost emotional
She came with her parents from Vladivostok to Moscow for the better circumstances and chances in figure skating.
Jumps are her strengths, sliding still needs to be worked on. Interesting to follow how she will grow and flourish under the Tutberidze Effect, together with Adelya Petrosyan. Sof'ya Akatyeva is their leading example in the 2007 born girls.
Her other performances were all great:
https://www.youtube.com/watch?v=UR5QtXbgal0
https://www.youtube.com/watch?v=9qx1JIIZRt4
https://www.youtube.com/watch?v=FdC1bF1qUKY
https://www.youtube.com/watch?v=k-CmJQTcHTc
But was there any weak performance by those wonderful kids?
BTW: Lyubov isn't on the roster for Pervenstvo Moskvy, neither are many of the other Ice Age, Kids, meaning she and those others are still 2Sp rank?
But all of them have learned so much during the show on presentation, expression of the images staged for them, it will help them in their careers.
There were many very good music tracks used in the show as well, would they make good choices for real competition program?
Another detail struck me: how attentive these children all are already. In the semis, where the short program was performed, Mariya Paramonova changed her snake costume mid routine, but the wire she pulled fell on the ice. After accepting her flowers, she searched for it and brought it back with her to the K&C, which Trankov commended her for.