Well, maybe not explicitly, but they certain did concede the fact that it may not be autistic individuals that created the art. That it could be done by those that may have traits that are shared by those with autism.
"Does this mean that talented individuals with ASC created some of the most exceptional depictions
in European Upper Palaeolithic art? Not necessarily. Exceptional precocious talent in realistic depiction,
associated with other traits such as focus on detail or overlapping forms, is also, rarely, seen outside of
autism. ‘Autistic traits’ are thus something of a misnomer, with their explanation rightly lying beyond an
extreme focus on ASC themselves.
Our closer consideration of the cognitive factors behind exceptional realism and other traits of autism
such as overlapping forms and precise detail, alongside our detailed large scale population survey, suggests
that the explanation for ‘autistic traits’ in Upper Palaeolithic art lies in local processing bias (and detail-
focus). Local processing bias is a cognitive bias which is very common in ASC, but also present in some
individuals without the condition."