if it is uniformly thick , and not very thick
inch , to no more than 2 inches
it does look from your pics like flank.
does it have , on its ends some some tendon like shite bits ?
of course , you could call the butcher shop
and ask if that's what they call flank
this is what a whole-rsh flank looks ike
its possible the tender-ous ends were cut off your example.