So I just read that FB post on the Wentworth ROTC page. I have to say that something doesn't pass the "Sniff Test". It seems really odd that Cadet Command would make an offer for an ECP program if the applicant did not express an interest in the program from these schools. To simply send out random offers that would now prevent them from continuing in the National ROTC Scholarship boards seems off to me. Like you stated they have never done this before and these scholarships were only offered from the ECP programs themselves.
The other post on their page really seemed a bit disturbing, they gave the average states for GPA and SAT/ACT for the first board, they then stated that if you were not in this range you should look at a GRFD, Minuteman, and ECP Scholarships. That is highly misleading and could sway some applicants that have a strong application into jumping into something they do not need to do yet. The whole thing looks a little misleading to me, I understand they are trying to recruit but this seems to go a bit far.
To the person that received the ECP offer, I would highly recommend that you contact a ROO at a school you listed on your application and ask them to confirm what Wentworth is saying in their post before you make any decision.