No. The primary characteristic of an informational interview is that the potential job seeker is the one actively gathering information. The stated purpose is for that person to learn more about the firm/partner/whatever. This sounds like a preliminary evaluation interview. There is no defined job on the line, but it sounds like the OP should be prepared to be actively interviewed, not be the one that is doing the interviewing.
I disagree with your characterization, because info interviews have much deeper purposes despite the plain language. Whatever you want to call it--informational or otherwise--OP needs to prepare for any interview as if a job offer is on the line.