The B-52 can be detected with COTS equipment by anyone who can solder and watch a Youtube video. The B-2 could not be detected by the most advanced radar equipment available to the time of its launch, and even today most equipment not fielded by or funded by Russia or the US could not detect it. Your mailbox key literally has a larger RCS than the B-2.

Forgive my ignorance, but I'm probably not the only one who is wondering what COTS and RCS mean here?

COTS = Commercial off the shelf (stuff you could pick up in a Radioshack before they became mini-Bestbuys, basically).

RCS = Radar Cross-section (a bit more field-specific, more or less how "big" the thing looks on radar, but it is a bit jargony -- it depends on things like the material and radar wavelength).

COTS -> Commercial off-the-shelf

RCS -> Radar cross section

COTS: Commercial off the shelf, stuff you can buy easily.

RCS: Radar Cross Section - how big of a reflection an object makes at radar wavelengths.

"Customer Off The Shelf" and "Radar Cross Section"

Commercial Off The Shelf

Radar Cross Section

russia doesn't need bombing anymore. The stealth bomber has had the rug pulled out from beneath its feet. It was effectively obsolete from day one.