Nvidia implements ECC in software since they did not want to add the extra memory chip(s) needed to implement it in hardware to their boards. The only case where they do it in hardware is when they use HBM memory.

That said, GDDR7 does on die ECC, which gives immunity to this in its current form. There is no way to get information on corrected bitflips from on-die ECC, but it is better than nothing.