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Dr. Petroff has also shown that the Higgs boson signal was actually sparks from someone microwaving grapes, the EHT black hole photo was a frozen bagel someone left in too long, and the LIGO detection was just someone slamming the microwave door too hard.
Microwaves travel through space at the speed of light because they are photons
If you want to get pedantic, as far as photons are concerned, photons don't exist. At C time dilation hits infinity, while length contraction approaches zero. Therefore photons travel zero distance and experience zero time. Therefore, from a photon's perspective, they don't exist!