No not all of them are using Ticketer. The majority of them (around 75% of them) are using Ticketer but some of the operators shown are using Almex / INIT / VIX ERG / Wayfarer so there is at least five different makes of ticket machines used by the bus operators shown on this map. This is why i don't think it is anything to do with what ticket machine they are using.
My suggestion that it's an agglomeration of the data provided to local authority sites still seems likely - this would explain why routes appear only on some days if operators only have some fitted buses.