Sorry, that's not how I remember it
You're right, Broughton said it -
http://www.skysports.com/football/news/11669/6431042/reds-chief-outlines-deal"They have built stadiums and they have restored stadiums. They have not committed to which is the right thing.
"We will have a stadium of more than 60,000. We will get substantial stadium development."
And:
http://www.liverpoolecho.co.uk/news/liverpool-news/well-give-you-60000-anfield-3392536"There’s definitely a commitment to invest in a stadium and we will finish up with a 60,000-plus seater stadium.
“Where they haven't finalised their view is whether that should be the new stadium or whether there are still opportunities to build at Anfield itself.
“They have done both. The people involved have built the new stadium at Baltimore Orioles, for example, and at Fenway Park they looked at the two options and decided that actually redevelopment with all of the tradition was better than a new stadium.
“They are committed to looking at both very professionally and seeing which is the best option.”
So yes, there was an agreement to supply a stadium, whether new or redeveloped, of Around 60k.