Not really but the USAF always assumes it is fighting a US vs US (alt skin #4) mirror match not against a nation whose military peaked in 1978. That's why B-2s have penetration aids like MALDs and use SEAD if they can.

Those passive radars can detect the B-2 but it's an OTH ping that tells you a B2 is coming. The Russian one basically detects the B2 for 5 minutes over Jan Mayan then loses it again. You can't shoot it down but it does tell you the US is attacking and letting you retaliate rather than having Engels-2 explode in a 500kt smoking accident and your first indication you are under attack is your double flash detectors screaming bloody murder.