Was going to suggest that the kid informed the coaches and they all agreed. The coaches may really like this kid but know he may fit better some where else because there are other guys Purdue stands a better chance with that fit better with what Purdue needs and wants. Maybe the coaches liked his tweet because they are good people who are happy for the kid...you can lose out and be happy for a kid you have recruited and built a relationship with over a year or two.That is odd. Possibly they all came to an agreement that Purdue may not be the best fit for him? Even if, it is a tad odd.
It makes it important if, for example, a player eventually wants to leave a program and Purdue has a need...makes it easier to get that kid on campus eventually.