Noticeably I found similarities in routes being filled in via demand from https://www.flightsfrom.com/. However this can leave some routes or flights missing with demands as there are some airlines that flightsfrom don't include. (Avelo Airlines, and other very small carriers or airports in smaller country). Things are also resuming to somewhat normal levels and the info being put into AE was put in during the pandemic making the information inaccurate. Airlines are also planning new routes as well which should be updated regularly with the demand.
Now that we also know with a simple few inputs from the developers we can modify a route demand in a heartbeat.
When submitting a demand request. It should go something like this.
Route: (Dep-Arrival) in ICAO/IATA format
Demand Estimated Number:
Website showing flight frequency/aircraft: airline-website, flightradar24, flights-from.com