The one with the biggest amount of transactions is 2,945 tx on it, and tx are each 10 minutes. so, taking about seconds i would say:
2954/60=4.92 transactions/second.
2954/60=49.23.... typo?
2945/10/60 is closer to your total.
He missed a 0 in 600, he did some math right, for that moment the average was around that number, funny enough that block came roughly 10 minutes after the previous, but for the last 24 the average is far lower, at 3.1.
But I think he asks about the maximum possible so that limit might actually be triggered by the number of coins and funds available and the number of channels, the network could theoretically do 1 million TPS a second but there might never be enough participants do reach that.