Many thanks for posting this. We usually take our bikes to Scotland on a combination of sleeper and local services once or twice a year so have an interest in this.
From discussions with a friend in the Hebrides it sounds like there has been a significant increase in cyclists on the Hebridean way route in the last two or three years, which means (as observed in the report) a large demand on the Barra ferry from Oban. Last summer we took that ferry on a weekday and there were nearly 20 bikes on it. On our return to the mainland we could not get a booking on the Fort William sleeper (already fully booked), so had to use the service to Glasgow and then take that sleeper (in our experience the easiest to get a bike onto).
Great to see the comment about the new sleeper trains having a refrigerated compartment for the fish instead of it occupying bike space!