You make it obvious you've never coached in the NCAA before the transfer portal. The rule you cited has roots back to at least 1991. In fact, the bylaw you sited has dates listed next to it:
"13.1.1.4 Four-Year College Prospective Student-Athletes. An athletics staff member or other representative of the institution's athletics interests shall not communicate or make contact with the student-athlete of another NCAA Division I institution, or any individual associated with the student-athlete (e.g., family member, scholastic or nonscholastic coach, advisor), directly or indirectly, without first obtaining authorization through the notification of transfer process. Before making contact, directly or indirectly, with a student-athlete of an NCAA Division II or Division III institution, or an NAIA four-year collegiate institution, an athletics staff member or other representative of the institution's athletics interests
shall comply with the rule of the applicable division or the NAIA rule for making contact with a student-athlete. [See Bylaw 19.1.3-(f).] (Revised: 1/10/91, 1/16/93, 1/11/94, 4/26/01, 4/29/04 effective 8/1/04, 4/29/10 effective 8/1/10, 10/30/14, 8/8/18 effective 10/15/18, 4/28/21 applicable to student-athletes seeking eligibility during the 2021-22 academic year)"
There is no new "modern enforcement framework" it's just the same. The only difference is you needed permission from opposing schools athletic directors before being able to contact athletes from that opposing school. You still WERE NOT ALLOWED to contact athletes at other schools before that. The rule was enforced the same way - no contact until the necessary paperwork is completed (whether it is transfer portal paperwork or written permission from the AD).