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For me HR offroad doesn’t appear to correlate at all with road or turbo. I think there is a load of elevation that is also exacerbated by the levels of excitement/fear/adrenalin.
Also I have power cranks on the Mtb and my heart rate is way higher off road for the same power output. Again I put this down to the fun/excitement. I can sustain a higher HR outdoors offroad than on turbo or road.
Garmin watch inside my sleeve answers that one. I was wondering about the estimated power - and agree it's likely total bollocks. If you're familiar with that trail there are punchy ups, but I wasn't pedalling for the vast majority of it.
What I'm more interested in is the HR - as a proxy for work done, really.