Third paragraph:
The radiometer used in this investigation has been described elsewhere (Penzias and Wilson 1965).
This paper is also from 1965; back then people aren’t so careful with their error bars. This paper won’t do for a Nobel Prize now. Herouni’s paper is from 2007.
Regardless, Penzias and Wilson’s experiment has been corroborated countless of times. Detecting the CMB is so easy that it is a common project for undergraduate/master radio astronomy classes.
You’re skeptical about this but not about Herouni’s measurement? This is double standard. Again, not all datapoints are of equal quality.