I am not sure exactly where the consulate found this rule about coverage having to be “split equally” between benefits but I assume it's to prevent people form using two unrelated insurance contracts not intended for this, which could leave them with a low coverage for one of the benefits. AXA's terms and conditions aren't really clear on this but it seems that medical treatment and repatriation are both covered up to €30000.
In any case, since
- the requirement for travel health insurance are defined in the Schengen visa code and apply to all member states (i.e. Germany is not supposed to make its own rules),
- the page from the German missions to the US explicitly lists AXA Schengen (among other insurers),
- and that contract is specifically intended for Schengen visa applications (and apparently used by thousands of people for this purpose)
it would seem exceedingly unlikely that it would not be appropriate to support a visa application or that the German consulate could refuse it.