There weren't a "much larger number" of radioactive isotopes produced during the early moments of the universe. Sorry, PhD or not, your author is wrong to have made such an ambiguous statement that would be interpretted by morons like the rabbi in the manner that he did. And, his "several billion" years ago is 13.75 billion years +/- .17 billion years (according to wikipedia. I could swear that I had seen a 13.72 billion figure floating around within the past year.)
The CORRECT interpretation of what he's referring to would be that he's talking about the matter which we see today. i.e. carbon, oxygen, etc. Those elements around us were indeed formed several billion years ago.
<side note: learn to cut and paste>
"radioisotopes with half-lives of less than about 108 years have become undectable in the 30 or so half-lives since their creation..."
Uhhh, is he saying they were created 3240 years ago? wtf? "whereas radionuclides with half-lives greater than 1010 years have decaded very little up to the present time" HUH?! There's only about 12% left of an element with a half live of 1010 years since 3240 years ago.
So, just what is this professor talking about? Seems you're having a little trouble with proof reading what you've cut and pasted. That would be 10^10 years, and 10^8 years. And, yes, I actually went to your link.
And, ohhhhhh, I see the problem. When he's talking about primordial nucleides, he is NOT TALKING ABOUT THE BIG BANG. He's talking about nucleides that are leftovers from supernovas. These are the things that make up most of the matter (anything beyond Hydrogen, Helium, Lithium, and Beryllium.)
So, it seems that I've taken the time to figure out what your source is referring to. Yet, you consider it a scientific consensus of something completely different. Why don't you take a look at nucleosynthesis during the early formation of the universe (first 15 or 20 minutes, after which, it was too cool for nucleosynthesis.)
THIS is the scientific consensus, which is contrary to what your rabbi idiot is saying.
http://en.wikipedia.org/wiki/Big_Bang_nucleosynthesis
[/LIST]Note bolded.