Greetings!
I am not going to comment on this particular event, but the issue of having sensors to measure actual aircraft weight.
This system has been tried out on several aircraft models over the years with little or no success. The problem is, as already has been pointed out, is to get an aircraft in a level position to get the weight right. This is virtually impossible on a ramp. The other issue is what type of sensors will be used...? Pressure transducers in the landing gear struts are most practical, but again level and friction in the struts will significantly affect the readings. We have the NLG pressure transducers on the B777 for "stab trim greenband" check, but are having trouble with this relatively simple system.
After all this; accurate OEW weigh jobs, pax and cargo weight estimates is still the best solution today and gets you within a safe range...
Dag