Quote from the end: "perhaps importantly, there is no warranty from Intel. This means that system builders will not be able to recoup costs on dead silicon, but they might give their own warranty to end users."
In that regard if latency is an issue overclocked 8700K (or 8086K) should be sufficient.
It is, but at some point you can't do much more about the network latency; shaving off a couple dozen us, might the difference of getting the price/quote or missing it out. Especially, when you play versus similarly equipped firms.
HFT is not so much about CPU speed but algorithmic optimization.