In very broad terms:
They were TF'ed to the level that was appropriate at the time using Prime95 and CPU's.
We now have GPU's and TF software for them. This raises the bit level that makes sense.
Yes, it would make some sense not to go as far in TF as if they were not yet tested.
Most of the DC work is LL, but there is some PRP DC too.
Some of the people doing the TF in the DC range are doing it to help close the gap between DC and the FTC ranges. So, they are willing to higher than might make sense.
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