I'd never heard of this experiment before. Video bro does a good job of breaking its TOE, task, and purpose down, but doesn't cite his sources.
https://www.battleorder.org/post/ussr-light
I did a bit of poking around on the interwebs and have been unable to find corroborating sources, so far.
Nevertheless, it's an interesting concept. From a T2k POV, I wonder if the Soviets, as the Twilight War grinded on, might have adopted a similar divisional TOE, at least in part, to account for a growing deficit of AFVs.
As always, I'm interested as to your thoughts on this topic.
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