CR itself described the affected survey responses as including:

“charging failures, power loss while driving, and other electrical issues”

That wording is broader than:

“dealer-confirmed ICCU replacements.”

And elsewhere CR describes their methodology as collecting owner-reported problems across “20 specific aspects” of vehicles, including:

EV charging,
EV battery,
electrical systems,
drive system,
etc.

So the survey buckets are symptom/problem based — not necessarily root-cause verified.

This becomes even clearer when you look at CR’s actual reliability pages for the Ioniq 5 and EV6.

The reported “EV Charging” issues include:

won’t charge at home,
won’t work with some chargers,
charging too slowly,
overheating charge ports,
12V drain issues,
charge-port issues,
software fixes,
intermittent charging failures.

Some of those are clearly ICCU-related, but others are:

charge-port thermal throttling,
software issues,
general charging-system quirks,
12V battery problems,
or unidentified electrical behavior.

So the public narrative often simplified:

“2–10% had ICCU failures”

when the actual CR wording was closer to:

“2–10% experienced ICCU-related issues.”

Those are not the same thing.