That specific piece of advice about Consultant vs. Intern ineligibility is half-right, but the mechanical logic behind it is crucial for your next steps.
Here’s the reality of how the internal recruiting machine works: EYP, like MBB, assesses you against the role you applied for. When you applied for Consultant, they screened you against a specific experience benchmark and salary band. Since you were rejected, your profile is now tagged against that specific, high-level process. Applying for an intern role immediately is almost always automatically filtered out by the Applicant Tracking System (ATS), because the system flags you as "previously assessed and did not meet the bar" for the higher-level position. They don't downgrade candidates easily.
You should anticipate a standard cooling-off period, which for a full-time professional rejection is typically 6 to 12 months across the Big 4 and MBB in the German market. This time allows the firm to assume you have acquired meaningful new experience or skills that might change the outcome.
Your best strategic pivot is to wait until that minimum 6-month mark passes, and then apply specifically for the internship role. Internships are the primary backdoor into any Big 4 Strategy Group. Applying for the intern slot 9-12 months from now, with a slightly refined CV, demonstrates you understand the recruiting path. Do not try to apply sooner—you risk triggering the immediate filter and reinforcing the negative flag on your file.
All the best with the planning.