TFA said nothing about ECC failing to stop RowHammer. TFA does discuss the cost of ECC (or ChipKill) and the fact that Intel does not even support ECC on consumer kit -- i.e., ECC's availability is rather limited.
"ECC RAM can detect and correct 1-bit errors and, thus,
deal with single bit flips caused by the Rowhammer attack.
Furthermore, IBM’s Chipkill error correction [27] allows to
successfully recover from 3-bit errors. However, uncorrectable
multi-bit flips can be exploitable [2, 3, 42] "
Maybe that, combined with a lot of weasel words about the effectiveness of ECC muddy the water.
