It certainly does correlate fairly accurately with my experiences, BUT there are as mentioned in previous posts, other contributory factors which can wipe out any perceived benefit. The wind direction or lack of it, bright sunshine or overcast and tbh that’s about it.
I plan my trips according to tides4fishing as I have a 1000 mile round trip and prefer the bigger tides, as for specific hourly hot spots, these generally coincide with the first of the flood which triggers most of my marks.
There are marks I fish on the drop, which coincidentally are high on the scale, BUT this is localised to one or two only.
So yes it’s a great starting point imo.