If all they're counting is the number of people who will actually get to view the former president, they may be correct. 24 hours = 86,400 seconds. You could get 100,000 people past him in that amount of time, but even if you split them into two lines, one on each side, each one would have less than two seconds -- it would essentially be a constantly moving procession. And you
know that some will take longer than two seconds to pass by.
On the other hand, I strongly suspect that there will be more than 100,000 trying to attend.
indeed, a little more then 100K people saw Babe Ruth. So for sure, they could not accomodate anything much larger then that.