First of all, the rule talks about the FORMAL written NLI offer. It does not prevent coaches from sending out an email that says: "We love your kid. If he/she is academically eligible, we are prepared to offer him/her $xxxxxx to play soccer here. This athletic scholarship, is in addition to any other academic scholarship or financial aid he/she may be eligible to receive".
Second, here is the actual rule. It says schools can't send out formal NLI letters until Aug 1 of the kid's senior year, and the kid can't sign the NLI until signing day. The OP said her son is a senior, and we are well past Aug 1.
18.104.22.168 Written Offer of Aid Before Signing Date.
Prior to August 1 of a prospective student-athlete's senior year in high school, an institution shall not provide a written offer of athletically related financial aid or indicate in writing to the prospective student-athlete that an athletically related grant-in-aid will be offered by the institution. On or after August 1 of a prospective student-athlete's senior year in high school, an institution may indicate in writing to a prospective student-athlete that an athletically related grant-in-aid will be offered by the institution
; however, the institution may not permit the prospective student-athlete to sign a form indicating his or her acceptance of such an award before the initial signing date in that sport in the National Letter of Intent program. (Revised: 4/29/10 effective 8/1/10)