> However, it is not possible to say since this class of professional certifications is not delineated.
Yes, it is quite specifically. The new rule also sets out standards (which would very much not seem to be likely to ever admit certification in dentistry) and a process for subsequent rulemaking to update the set of certifications, but any problem with certifications later adopted would be an issue with those actions, not the immediate action.
The initial set is "the General Securities Representative license (Series 7), the Private Securities Offerings Representative license (Series 82), and the Licensed Investment Adviser Representative (Series 65)". [https://www.sec.gov/rules/final/2020/33-10824.pdf, bottom of p. 28]