Most likely. But the conclusion is still incorrect. The FAA does not see models as apart from sUAS, they see them as a type of sUAS. The term sUAS did not exist at the time of AC 91-57 so to refer to it in that sense has no real meaning.
For years Models have been getting specifically excluded from FAA rules
(ASF400/G0801, Policy07, Policy10) that govern UA/UAS,
because those rules acknowledge models are UA/UAS but a special sub type of sUAS.
Folks are mistakenly bashing different FAA texts and time periods together.
30years ago there was a Model Aircraft AC, ac91-57.
Years later came ASF400, and then later came its new version, Guidance0801.
and to put all these hard rules into plain english the FAA put out Policy07 for easy understanding.
THEN, after all the existing stuff is considered, comes requests from the public to the FAA in the sUAS ARC, which the FAA may use all/some/none of in upcoming rules.
Yet folks want to pretend ASF400/G0801 never existed.
They want to pretend that any FAA requirement dictating conforming to AC91-57 dont matter cause AC91-57 in itself is voluntary (that 'voluntary' part of the AC coming 20-25years prior to the current non-voluntary FAA docs).
And folks want to grab quotes from the sUAS ARC and throw them about like they are already codified in the CFRs
One example here is folks using the term 'commercial' to test FAA ruling, when that term is from AMA not G0801/Policy07. Policy07 is very clear over Public-Civil-Model authorizations, yet folks want to use AMA definitions(commercial) to resolve FAA rules.
Add in how folks have a hard time understanding that outsiders dont have to even read the AMA member rules, and we wend up with a lot of folks with strong opinions and faulty underlying knowledge, trying to have their feelings taken as fact
Perhaps AMA should put Guidence0810, Policy07, and Policy10 up in AMA docs page
next to the paintball and AC91-57 pdfs,
and maybe folks will begin to discuss the subject with less ignorance
of what is, vs what could be, vs what never was, FAA rules