the ratio of artillery is essentially a proxy for the casualty rate because this is an artillery battle. I remember an interview with a foreign volunteer in Ukraine who claimed that most Ukrainians never even get to see a Russian soldier, and when they do, it's the slightest glimpse before they retreat and start blasting them with artillery again.
there's a counterclaim that astshually it doesn't matter that Ukraine is firing 10 times less artillery because they're 10 times more accurate, but this is just a very strange claim; Russian artillery is superior to the West's and any issues earlier on in the war with lots of misses have been largely solved by now
at the end of the day, who is constantly doing counteroffensives? Ukraine, not Russia. who is constantly needing to do mobilizations? Ukraine, not Russia. who is needing to kidnap people off the streets to funnel them into the military? Ukraine, not Russia. whose country is overflowing with graveyards? Ukraine, not Russia. most of Russia's September mobilization - the only one they've done - hasn't been devoted to the battlefield yet because they're being properly trained and nurtured for some future role, which would be impossible if Russians were dying in large numbers as Ukraine claims.
one can be like "oh but Russia is just hiding all this stuff" but I think it's a lot harder to hide that level of mass death than people think. if Ukraine could, I reckon they would, and they have the entire Western propaganda network at their backs.
truthfully I don't know exactly how many Russians and Ukrainians have died, but claims that more Russians have died than Ukrainians is genuinely comical, like "Oh, I know this person is a complete dipshit and I know to never listen to them on any take if they can be so completely moronic here," it's like the "100 million people died under communism" of Ukraine War talking points at this point. and I would genuinely be extremely surprised if the ratio was less than 1:2 in favor of Russia. Lukashenko thinks it's 1:8, which is probably too high but like, he also probably has a better idea than me.