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DrDave
It's not the steep head-tube that makes the ETT longer - its the slack seat angle. The frame will actually fit both of you perfectly, and the Reach dimension is more important than the Effective Top tube - let me explain..
It is technically a 47cm frame (measured bb to centre of top tube) compared to other manufacturers frame sets. Those mainstream smaller frames tend to have a steep 75 or 76 degree seat angle bringing you more forward, but with a 520mm effective top tube. This smaller Storck geo is unusual in that that the seat angle is slacker at 73 degrees so hence the effective top tube measurement will be 20mm longer (but 20mm in the backward direction to the rear wheel, not additional towards the front), hence Storcks use inline seatposts to get the same bum over rear wheel position - The reach to the handlebars is still similar to other 47/49cm bikes.
I'm not tall (5ft 4), and the pictured set-up position is identical to my old custom made to measure Rourke, and similar to my 49cm Aethos and previous Tarmac. The wheelbase of this Storck is also very short compared to mainsteam bikes at 960mm (a good 15mm shorter than most 47/49cm frames, even with the 73degree seat angle and ETT), and along with the very steep head angle feels very fast and aggressive. It's probably only one of the few (non-custom) small frames, that is not geo compromised and handles like a larger sized bike.