score:3
Regarding the 2-year rule, from the site you quote:
Exchange visitors are generally made aware of this requirement when they agree to participate in exchange visitor programs or at their visa interviews.
However, if you are unsure whether this requirement applies to you or your situation, you should request in writing that the Department of State, Waiver Review Division conduct an advisory opinion.
Whether or not required depends upon details you have not provided us (as also mentioned at the same site). However, my guess is that it does not apply to you.