Hi
I guess, its Bell approach to incorporate a fenestron type tail rotor - without infringing Airbus patents.
Unfortunately, with fixed blades and variable speeds there might be some high pitch noises - which the original fenestron had also - but was overcome by the unequal spacing of the blades.
I´m also not sure, how well speed changes will cope witch quick demands of power?
And - with different speeds of the fans there will be different speeds of the airflow - while with a "conventional" fenestron/tailrotor (roughly) only the amount of air is altered.
Advantage is the removal of gears - but I´m not quite sure, if that will also be a weight benefit, cause wires which can take high amps as well as electric motors and additional generators will weight.
So I´m skeptical - don´t like the look either.
From an engineering point I really don´t see an advantage from four fans - compared to one bigger one.