The role turns out to be supervisory or operational rather than professional. The title matches a listed profession, but the actual duties do not require the qualification the profession is defined by.
The title is not the work
This failure is common precisely because nobody is being dishonest. An employer promotes a capable technical person into a role that mixes professional work with running crews, and calls it by the professional title because that is what the person is. The immigration question is narrower: does this position require the qualification the Appendix line names, and is the work professional in character.
The way to find out is to ask for a task-level description of a typical week and read it without the title attached. Where professional work is a minority of the role, the options are to redefine the position so that it genuinely is professional, or to look at a different category. What does not work is leaving the arrangement as it is and describing it more favourably, since the description will be tested against what the person actually does.