However, according to the site, there is no option for “Short Fare” tickets (i.e. 2 hours or less), whereby a short trip on all forms of transport can be covered by the one ticket.  Based on this, I assume that the situation that I described above is what occurs in such situations.  In Melbourne, however, the Metcard (their Integrated Ticketing system) is the default ticket for all providers.

There also does not appear to be a “10 short trips” ticket, which is standard in Melbourne, but I assume that it stems from the previous point.  This means that to get any practical benefit from the TravelPass, one would need to travel every day using this pass, which is not necessarily the same usage pattern that car users take.

Therefore, I’d hasten a guess that Melbourne’s system is certainly more comprehensive/flexible than Sydney’s.

But anyway, thanks for the note pulling me up — I’ll add a note to the post when I get around to it.