No. 5g is a more efficient way to transmit data, not a significant bump in transmit power. RFID devices are unpowered, so their primary limitation is how much power they can reflect, and 5g doesn't really change this.

But if you are in a crowd, and someone pumps up the power and uses a highly directional antennae like a parabolic dish, they might be able to pinpoint you. This has been the case for awhile and has nothing to do with 5g.