A focused technical conversation about one decision — not a general introduction and not a sales call. You send the pre-read material beforehand so the session starts with the actual problem rather than with context-setting.
The deliverable is the written output afterwards: a written summary of options with a recommendation and the reasoning. That is yours whether or not you engage Dmitri for the follow-on work.
If you do not have all of it, book anyway and say what is missing. Turning up without material is still more useful than guessing at a scope on your own.
14 years delivering sustainable product design and machine safety engineering work for industrial automation and automotive clients. I work to ISO 26262 and ISO/TS 15066, deliver in Siemens NX and PyTorch, and hand over a complete, checked document set with a clear design basis so your reviewer or authority can follow every assumption.