Or probably used to what he was using generally.
It didn't look like Sagan had issues with it when he rode it.
TBF, with Endurance bike, the pro often sized down to gain similar headtube length as their race bike.
Sagan's bike was custom made for him. Nominally a size 54, but with a 58 cm top tube and a 140 mm stem.
It's not exactly representative.
I got that, geometry is still largely the same nonetheless (beside the small bit says maximising the brake clearance with the Red calipers).
@andyp started
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Or probably used to what he was using generally.
It didn't look like Sagan had issues with it when he rode it.
TBF, with Endurance bike, the pro often sized down to gain similar headtube length as their race bike.