“He said they have been attritioned to the point where they have little veteran leadership left.”
It’s basically an assertion that suggest that all the veteran Ukrainian soldiers, etc. have been either attrited - killed or casualties have seen them removed from the battlefield.
That Ukraine military forces are running with basically under-experienced or green officers and troops.
some recent reports within the last few days have openly said, I believe it was the guy who runs the US Mozart Group, that stated that the Ukrainians are fielding men ‘who have never fired a gun before’.
As a result, Ukraine's combat troops are far better led, trained, supplied, and supported than those of Russia. And unlike the Russian practice of putting and keeping troops in the line until they are militarily ineffective, Ukraine pulls exhausted troops out for recovery, resupply, and to absorb replacements. Sadly, for Russia, there are numerous accounts of untrained and unequipped conscripts sent into the front lines and slaughtered.