The "Dr Toole" curve - please stop calling it that - is explained in my book as the average steady-state room curve, above the transition frequency at least, generated by loudspeakers that have received high sound quality ratings in double-blind tests over several decades of hundreds of tests. This identifies loudspeakers with the minimum resonant coloration - the most neutral - which is what we want as a starting point. Achieving such a curve in your room indicates that you MIGHT have purchased excellent loudspeakers. Compensating errors could also generate a nice looking curve, but not sound as neutral. Equalizing a flawed loudspeaker to create this curve, using it as a target, guarantees nothing - don't bother. But people do and fill pages of forums discussing the results - a social media exercise, not science.If I understood your paper correctly, what's publicly known as Dr Toole curve (and I agree that's unfortunate and it's difficult to reach accurate information on the web especially in audio related subjects) is expected steady state response (radiated direct sound) of a speaker in a home theatre environment (small/reflective room) with a reasonably flat direct sound. What's publicly known as Harmon curve is the result of an experiment in which listeners adjusted bass and treble controls to achieve a satisfying spectral balance. I don't remember a specific volume level the test was run though and it can make all the difference in the perceived bass level which is probably coincidentally also the difference between these two curves.
The so-called "Harman" curve was a tone-control exercise which allowed listeners to play with broadband spectral trends (not normal resonances) to satisfy a preference for the particular programs being used. Young, inexperienced, listeners boosted bass and treble - but was it because they liked that result or was it because they wanted it louder. Unfortunately, we don't know from that test and further tests were not done. The starting loudness was a good foreground listening level, not a rock concert level or a chamber music level.
Being able to adjust bass level is essential for fussy listeners, but is not always available without frustrating layers of menus and momentary silences while digital adjustments are made. Old fashioned analog tone controls were truly useful. Small changes in bass level matter a lot.