As Paolo and Yavor have remarked, the design of the wings is below standards as known around 1918. Obviously not an experienced designer or construction firm. The landing gear construction is special too, showing 6 wheels in the picture (two wheels on the central skid and two wheels at either side of the fuselage). A heavy construction, where the machine rested on the ground at the back of the fuselage (tailskid).
Given that from outside M. Larrabé was hired in as a carpenter, there could be challenges with the workforce expertise or strength.
This triplane was most likely the ambitious creation of someone and the first machine built by the construction firm. Given the lower than expected real performance (in combination with the Armistice 1918), the existence of this machine was not released to the public (magazines etc.). Sure the government must have known (and approved) that someone was designing and building a triplane machine in war time, as the construction material and the engines had to be approved for this machine.
It is special that this machine comes up in this picture, while no other data is even known about this machine. The only hope probably lies somewhere in the French SHA archives
Cheers
Kees