I agree with @fenwaypark. Posting publicly that a kid is committed to a school prior to signing the national letter of intent is a pretty clear no no, at least in D1. They may be able to respond affirmatively that they are recruiting a kid when asked by a stringer for one of the recruiting services, which is I think the intent of the rule cited above. In addition, for the Ivy schools, such a posting would be violative of the Ivy Common Agreement, which only allows the school to provide “probabilistic communications” after October 1, senior year. It may be that the reason that some of the posting are done in order for certain schools is that they are posted by one of the people who follow recruiting in that sport at that school. There are tons of sites that track recruiting in the popular sports and collect lists of “committed” kids (usually by following twitter feeds or facebook postings) and then compiling lists of “commits”
without ever getting any direct information from the school. In fact, that is how the recruiting sites operate.