Krista
The online data base includes those classified and were put in the Classification Guide. Some get removed because they've been lost. I don't know if they still do it, but the ADS used to put out a list of cultivars they believed were missing to see if anyone had them. If not they would be removed.
Iler's you have not listed in the online Classification guide never made the guide. Either because they wouldn't pass or because they never got that far. Hopefully, some of the cultivars Rivers is releasing might get classified.
The person who purchased the Iler's property also took over growing dahlia, but she was unable to take over the website where all the pictures were to help her label what she has.