I suppose that table can be derated for lower voltages and internal resistance in the meter
...and because CAT III has at least one circuit breaker between you and the nearest substation.
If you live in a house where the mains sockets can demonstrably supply 50kA then I suggest you contact your electricity provider.
Especially here in the UK where the normal practise is to run the power feed either along the side of the street or in the middle of the street and tap of to each house in turn. That then gives each house a reasonable length of cable from the tap-off point to the meter, then there are the meter tails, and at least 1 circuit breaker of a current limiting type plus the cable run from the circuit breaker to the socket in question.
The supply authorities demand that a dwelling be designed to handle a 16KA fault at the consumer unit, so the 50KA does not apply to domestic dwellings. I used to work for a manufacturer of domestic wiring accessories and it was calculated at the time of that regulation being introduced that the maximum fault current at the average socket in a domestic property was rarely going to exceed even 6KA once all the cable impedance had been taken into account and the speed of a modern MCB has already disconnected the supply before 50% of the maximum fault current has been reached and modern UK specification MCB's are all designed to safely handle a fault current of 10KA.
So that clearly suggests that this meter is fully rated for its intended use, with in and on normal domestic use as those fuses will safely handle 10KA otherwise it would not have have received the certification.