Having “upper” academic training is no measure of someone’s expertise, and never should be the defining characteristic of what an expert is. On the other hand, people with advanced education are probably statistically more likely to be experts. That’s something that was probably more the case 20, 30+ years ago when citizen science and accessible literature was more of a problem.
A lot of researchers and taxonomists these days, the people publishing species revisions and studying those species, are hobbyists. They do it in their free time because there is no job that encompasses that role. Additionally, a lot of necessarily field skills are not taught in the classroom so that’s where “amateur” and “untrained” experts become valuable.