>>1749514it's a minivelo
smol wheels are to make it compact for taking in apartments and on public transport, also for smol people
the top tube that doesn't go to the top of the headtube, and the additional slanting tube are theoretically to give more top tube clearance, to wear a skirt or to make it easier to get your leg over there with a lot of rear baggage. Non-folding minivelos like that are also just aping Moulton design, which is how it is for folding and meme reasons.
That drawing is also not accurate, it doesn't make sense. The tube that slants down from the top of the headtube would either be 2 tubes, both small, on either side of the top tube, or, 2 sections of tube, that start and stop on either side of the top tube.