No that was never the claim, modern precision artillery shells was the actual claim, it got mistranslated a few places. What they've been firing a lot is old old dumb missiles. and the failure rate of these old shells is quite high, not high enough to not be effective but they are seemingly out of precision artillery shells
Back to the tank thing, there have been some T-80s spotted on the way to the front in the last few days but they aren't modernised T-80s they are much older without the upgrades. The T-80 also, has a notorious short range and therefore needs is fuel guzzling gas turbine engine heavily re-supplied. They also aren't very easy to service in the field, which is the reason the t-72 became more dominant
Quite soon they might be launching all the toilets and washing machines they liberated from Kyiv via newly made trebuchets