I think that what may be going on here is that Russia has had more artillery shell manufacturing capability than NATO (or did earlier in the year; not sure what the present situation is). Mark Rutte — as Secretary General of NATO — highlighted this about halfway through 2025, while urging members to increase their production capacity:

euronews.com/…/is-russia-producing-a-years-worth-…

NATO Secretary General Mark Rutte has repeatedly said that Moscow’s annual ammunition production capacity is four times greater than that of the western alliance.

In a keynote speech in London last month, the NATO Secretary General Mark Rutte repeated a warning he has made in public at least three times this year: the western alliance is severely lagging behind Moscow on ammunition production.

“In terms of ammunition, Russia produces in three months what the whole of NATO produces in a year,” Rutte said on 10 June, adding that Putin’s war machine is “speeding up, not slowing down".

Yet the Western alliance is looking to dramatically close the gap in 2025.

The European Commission has set a target to ramp up ammunition production to 2 million rounds per year in 2025, while the US is looking to hit a new target of 100,000 rounds per month by October.

As best I can tell, Russian media grabbed the quote about artillery shell manufacture and ran with it, presenting it in such a way as to convey an impression that Russia has more military-industrial capacity as a whole than NATO does. I imagine that that plays well with domestic audiences, but…