Depends on how you count. 5000 km might be manageable.
My guess is he was thinking of 3200 km.
Maybe at 6:15 he wasn't firing on all cylinders? Even though I think normally at that time he's been up for a few hours, had plenty of coffee, and done a workout or two (or three).
Having changed my units of climb to meters, there's a serious round number (50K) on the horizon, though it includes all activity for the year, not just biking. Seems like I ought to get it today, as long as I can get out the front door.
And my assumption is that that total is accurate within 50%, maybe?