As F-35 critics are quick to remind us (because we don’t already know - obvs) any decrease in RCS or increase in jamming and agility only reduces the Pk if it out paces the threat. So in the case of the Super Sukhoi they may have done marvellous things but the attackers’ Pk may have still increased over time.
wrt to Meteor and indeed any system - you can spec whatever you want...it’s what you actually get in your hands that matters and I would love to see how a URD specifies Pk...