I think shizcakes knows that it was not integrated advertising into This American Life, but into the program from the '40s. shizcakes' comment, then, is likely

I think shizcakes knows that it was not integrated advertising into This American Life, but into the program from the '40s. shizcakes' comment, then, is likely a comment on how hearing the integrated advertising "sounds normal" for a program from the '40s, but does not "read normal" in text.