Here is a much more recent article.
How Ukraine is Crushing Russia’s Famed “God of War” Artillery
https://www.newsweek.com/russias-god-war-failing-1816722
“Russian artillery shortages and escalating casualties have been a constant theme of intelligence reporting since the height of the push by Russia to take the town of Bakhmut. U.S. intelligence now estimates that Ukraine has superiority over Russia in tube artillery, while Russia leads in rocket launchers. The British Ministry of Defence intelligence stated in early July that Russia has “implemented a shell-rationing regime for artillery in an attempt to preserve its critical indirect fire capability.” In English, this means that Russia, which had been at one-time firing as many as 50,000 artillery projectiles (that is, “shells”) in a day, it is now down to a little more than one-tenth of that number, with Russia only using artillery in token attacks over many of the sectors along the 1,500 mile front, according to U.S. intelligence analysts, concentrating its use of artillery where Ukraine is most active.”