Ok - somewhere - we are not communicating - I will simplify it for you;
1) Cohen was busted for saying (lying) that the Trump Moscow tower talks only went on until January 2016.
2) The lie that he told - contradicted evidence - and Cohen changed his answer and stated that the talks went on until June 2016.
3) Rudy just said that Trumps testimony - states - that the Trump Moscow tower talks went on until NOVEMBER 2016 - right up to election time.
4) Why are Trump and Cohens testimonies different?
5) The candidate was lying to the American people and saying no deals in Russia, no deals that might happen, no deals that will ever happen, etc..
6) The Russians knew Trump was lying about this - and could use this info to blackmail/threaten Trump
If Mueller has evidence on Cohens testimony (through all the tapes/electronic devices/paperwork) that they recovered in Cohens office/residence
and it is different than Trumps answers then Trump perjured himself.
I am sure Mueller already knows about Trumps perjury - but Mueller doesn't leak - so this Julie-Yanni blunder is the first we have heard that the talks went on all the way until the election (I am more than sure that the talks actually are still ongoing - as evidence by Helsinki and Argentina where Trump basically fellated Putin - in secret - and in front of the world)
Rudy's interview might not be new evidence to Mueller - but it is new public evidence that the Moscow tower talks went farther than had previously been revealed.