I agree. I don’t think that some of the results are repeatable, yet to me it doesn’t matter in one sense, because a positive result proves that something is possible, and that is very interesting to me. For example, the difference between modem #1 and modem #4 behaviour is, I would expect, just due to random stuff.
Am I right in thinking that the HCP is a recent thing, completely unknown before 2020 ? Have I ever reported it, and have any other kitizens seen it ever? To qualify, someone has to show their bits-vs-tones or SNR-vs-tones (aka ‘vs bins’), and they only have to have a small hollow. Do not confuse the required shape with that caused by a pilot tone, or very narrow band interference from eg radio stations. The HCP only needs to be of modest width, say 15 tones, in the very early stages, but will be developing rapidly to cover tones 40-80 or 40-85 in the case of ADSL downstream. I have absolutely no idea if such a thing as VDSL2 HCP exists or is even possible.